Update:

With use I found it didn't work well (sound wouldn't come out), and the weight of the iPhone shifted the whole assembly in a way I found dangerous while driving.

Customer support was great and I received a prompt and full refund after I said that I considered it defective.

___

I'm using this with an iPhone 4. It replaces my old car dock/FM transmitter which I used with a video iPod. The old card dock/FM won't charge the iPhone 4, and holds it vertically, which is why I'm trying out this product.

This product seems to be well-built and the sound is good. Problem is that it takes several actions to get it going:
--release rubber grips
--place phone in the grips
--squeeze rubber grips
--plug in 30 pin cable
--plug in audio/mic cable (optional for handsfree use)

I'll get used to it, but I'm not likely to do all this for my 10 minute commute. I don't like the placement of the audio/mic cable--it brushes against my knee. By the way, this product fits ok in a 2005 Scion tC.

FYI, the "autoscan" feature doesn't really scan. It just has four fixed presets that you can switch among, and tune up or down from each of these.
Update:

With use I found it didn't work well (sound wouldn't come out), and the weight of the iPhone shifted the whole assembly in a way I found dangerous while driving. Customer support was great and I received a prompt and full refund after I said that I considered it defective. ___

I'm using this with an iPhone 4. It replaces my old car dock/FM transmitter which I used with a video iPod. The old card dock/FM won't charge the iPhone 4, and holds it vertically, which is why I'm trying out this product. This product seems to be well-built and the sound is good. Problem is that it takes several actions to get it going:
--release rubber grips
--place phone in the grips
--squeeze rubber grips
--plug in 30 pin cable
--plug in audio/mic cable (optional for handsfree use)

I'll get used to it, but I'm not likely to do all this for my 10 minute commute. I don't like the placement of the audio/mic cable--it brushes against my knee. By the way, this product fits ok in a 2005 Scion tC. FYI, the "autoscan" feature doesn't really scan. It just has four fixed presets that you can switch among, and tune up or down from each of these.