I have Verizon and I had a Droid Incredible. It was garbage. For all it's touting all these incredible apps, they never worked. Netflix? I was so excited to get that on my HTC Incredible but - always loads/buffering even with a good 3G signal makes it impossible to use. The buttons wore out over time - I can't turn it off/on or make the screen sleep anymore. And battery life - even with brand-new batteries, MAYBE lasted a day with normal use. Garbage.
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So, I have received my new iPhone 4S, 64 Gig thing.  I know there are a million reviews and opinions out there, so let me tailor my comments for the Verizon/Droid -> iPhone user.
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First things you notice:
1) It's a much nicer design.  The stainless steel bezel.  The flat back and front.  It's heavier, which is OK. The buttons feel very SOLID.  I like that very much. There's an actual SWITCH on the side to make the phone quiet (it will also stop it from vibrating if you set it up in Settings under Sounds (not vibrate?)).
2) While the interface is nice, it's not as intuitive as a Droid system.  You can't say, create or download an app that changes the screen brightness or volume levels.  You can't download a shortcut widget/app to like turn wifi on and off.  With the iPhone, it's Apple's way, or the highway.  If you want to turn bluetooth off, you have to go into settings and look for it.  No shortcuts here, my friend.
3) Updating your contacts.  When I first got my iPhone, because I'm on Verizon, I had to download their stupid VZ Contact Transfer app.  It wouldn't work.  And by that I mean when I went to search for something on the app store, I got the error "No Matches".  This was incredibly frustrating.  I tried not to freak out, and the next day, it worked just fine.  I was able to find and download apps and updated my contacts, etc.  So, if you have this problem, be patient, it will resolve itself.
4) The keyboard ROCKS.  I can type MUCH faster on this touch-screen phone.  It's great.  And even though the auto-spell feature only offers one alternative to what you're typing, I either usually need that word or ignore it since I'm typing so fast (correctly) anyhow.
5) Siri is fun.  I was cooking and needed to know how many tablespoons were in a cup.  I asked Siri, she told me 16.  Boom.  Easy.  It's a fun feature on this phone that I like and find entertaining.
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It's smooth.  It works.  It's solidly constructed.  I've learned to turn off Siri and Bluetooth and Wifi to save battery life.  I've found apps that I wanted and downloaded them and gotten them to work. I'm a little disappointed that you can't download apps to like, change the screen brightness or turn wifi off and on.  It's either Apple's way or not at all.  I've gotten used to it.  Call quality (strange that it's the LAST thing I mention on a PHONE!) is passable.  Do people still TALK on phones anymore?
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** UPDATE **
I can't get the battery to last a day.  I've done all the tricks I've read about online: turning off all kinds of sensors and Siri and stuff.  Still, if I just use the phone for like an hour, the battery drops dramatically.  It's at like 20% now and all I've done was run an app or two and maybe check Facebook once or twice.  It's garbage.  I'm bringing this to an Apple store to see if they will replace it.  I think it's totally weak they would release this product, claim it has excellent battery life, only to have it die every day no matter what I do.
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** UPDATE **
It's been awhile and I still think the battery blows.  Basically, you can't use SIRI, leave your GPS on, leave your Bluetooth on, leave your wireless internet on, or leave anything running in the background.  Using your phone for what it's intended (all the glorious features it brags about such as Siri, bluetooth, etc) just utterly destroys your battery.  I hardly use my phone at all.  I quickly check it during the day for things, maybe play a game or send texts, maybe use it at the gym, and it's just about dead by the end of the day.  It's a joke.
I have Verizon and I had a Droid Incredible. It was garbage. For all it's touting all these incredible apps, they never worked. Netflix? I was so excited to get that on my HTC Incredible but - always loads/buffering even with a good 3G signal makes it impossible to use. The buttons wore out over time - I can't turn it off/on or make the screen sleep anymore. And battery life - even with brand-new batteries, MAYBE lasted a day with normal use. Garbage. -
So, I have received my new iPhone 4S, 64 Gig thing. I know there are a million reviews and opinions out there, so let me tailor my comments for the Verizon/Droid -> iPhone user. ---
First things you notice:
1) It's a much nicer design. The stainless steel bezel. The flat back and front. It's heavier, which is OK. The buttons feel very SOLID. I like that very much. There's an actual SWITCH on the side to make the phone quiet (it will also stop it from vibrating if you set it up in Settings under Sounds (not vibrate? )). 2) While the interface is nice, it's not as intuitive as a Droid system. You can't say, create or download an app that changes the screen brightness or volume levels. You can't download a shortcut widget/app to like turn wifi on and off. With the iPhone, it's Apple's way, or the highway. If you want to turn bluetooth off, you have to go into settings and look for it. No shortcuts here, my friend. 3) Updating your contacts. When I first got my iPhone, because I'm on Verizon, I had to download their stupid VZ Contact Transfer app. It wouldn't work. And by that I mean when I went to search for something on the app store, I got the error "No Matches". This was incredibly frustrating. I tried not to freak out, and the next day, it worked just fine. I was able to find and download apps and updated my contacts, etc. So, if you have this problem, be patient, it will resolve itself. 4) The keyboard ROCKS. I can type MUCH faster on this touch-screen phone. It's great. And even though the auto-spell feature only offers one alternative to what you're typing, I either usually need that word or ignore it since I'm typing so fast (correctly) anyhow. 5) Siri is fun. I was cooking and needed to know how many tablespoons were in a cup. I asked Siri, she told me 16. Boom. Easy. It's a fun feature on this phone that I like and find entertaining. ---
It's smooth. It works. It's solidly constructed. I've learned to turn off Siri and Bluetooth and Wifi to save battery life. I've found apps that I wanted and downloaded them and gotten them to work. I'm a little disappointed that you can't download apps to like, change the screen brightness or turn wifi off and on. It's either Apple's way or not at all. I've gotten used to it. Call quality (strange that it's the LAST thing I mention on a PHONE! ) is passable. Do people still TALK on phones anymore? ----------
** UPDATE **
I can't get the battery to last a day. I've done all the tricks I've read about online: turning off all kinds of sensors and Siri and stuff. Still, if I just use the phone for like an hour, the battery drops dramatically. It's at like 20% now and all I've done was run an app or two and maybe check Facebook once or twice. It's garbage. I'm bringing this to an Apple store to see if they will replace it. I think it's totally weak they would release this product, claim it has excellent battery life, only to have it die every day no matter what I do. -----
** UPDATE **
It's been awhile and I still think the battery blows. Basically, you can't use SIRI, leave your GPS on, leave your Bluetooth on, leave your wireless internet on, or leave anything running in the background. Using your phone for what it's intended (all the glorious features it brags about such as Siri, bluetooth, etc) just utterly destroys your battery. I hardly use my phone at all. I quickly check it during the day for things, maybe play a game or send texts, maybe use it at the gym, and it's just about dead by the end of the day. It's a joke.