UPDATE October 12, 2009
As much as I loved this phone, after 18 months the handset stopped ringing.  I contacted support and the only thing that can be done is to replace the handset - which may or may not solve the problem.  I understand that the warranty is one year, but am disappointed that such an expensive phone has such a short life.

I bought this phone because I work from home 4 days a week.  I make a lot of international calls and I had trouble hearing on my previous headset and land line phone.  I chose this phone because it had all of the features I was looking for and included the headset - meaning I would have no configuration problems.

What I love:
Easy to use volume control button for both dialing and voice.
Excellent sound quality.
Lightweight handset with belt/pocket clip.
Mute soft button on the handset - it is surprising how many phones do not have a mute button.
Speaker button is great for dialing, then I switch to the headset - I don't like the load dialing tones in my ear when using the headset.
Nice neat base to store and charge both the handset and headset.  The base will also charge my Plantronics Voyager 510 headset.
I can use the included software to update my phone book (see note below about Outlook synchronization).

Could be better:
Headset sometimes slides around my ear.  There are no foam adapters to customize a good fit like those that come with some other Plantronics bluebooth headsets.
If you want to synchronize with Outlook, you are limited to around 200 contacts and the field names are shorter.  You will probably have to edit names to fit the available field lengths.  I don't change my contacts too often, so synchronization with Outlook is not important to me.
The "select" soft button on the menu is on the right side of the screen, but on most cell phones it is always on the left.  Admittedly not a big deal, but it is a bit annoying.
UPDATE October 12, 2009
As much as I loved this phone, after 18 months the handset stopped ringing. I contacted support and the only thing that can be done is to replace the handset - which may or may not solve the problem. I understand that the warranty is one year, but am disappointed that such an expensive phone has such a short life. I bought this phone because I work from home 4 days a week. I make a lot of international calls and I had trouble hearing on my previous headset and land line phone. I chose this phone because it had all of the features I was looking for and included the headset - meaning I would have no configuration problems. What I love:
Easy to use volume control button for both dialing and voice. Excellent sound quality. Lightweight handset with belt/pocket clip. Mute soft button on the handset - it is surprising how many phones do not have a mute button. Speaker button is great for dialing, then I switch to the headset - I don't like the load dialing tones in my ear when using the headset. Nice neat base to store and charge both the handset and headset. The base will also charge my Plantronics Voyager 510 headset. I can use the included software to update my phone book (see note below about Outlook synchronization). Could be better:
Headset sometimes slides around my ear. There are no foam adapters to customize a good fit like those that come with some other Plantronics bluebooth headsets. If you want to synchronize with Outlook, you are limited to around 200 contacts and the field names are shorter. You will probably have to edit names to fit the available field lengths. I don't change my contacts too often, so synchronization with Outlook is not important to me. The "select" soft button on the menu is on the right side of the screen, but on most cell phones it is always on the left. Admittedly not a big deal, but it is a bit annoying.