I have had mine since last friday...
I have had mine since friday 10th November and I have to say that it works ok, there are a couple of niggly bugs, but nothing major.
1. If you dial a call from the phone and the call clears from the other end the headset will not automatically flip back to music.
2. After making a call, when the BlueEye does not return to audio mode, it will not receive the voice from the phone when you make another call, unless you manually flip the BlueEye back to iPod/Radio first
This isn't too much of a problem as you can quickly hit the play button on the BlueEye and then make your outgoing call, but it is a bit annoying, I am sure it will be fixed in the next firmware. I have tested with a Samsung SDH-D600 old style Nano 2GB and an iPod Photo 40GB.
Gear4 have great customer service, I had my BlueEye on pre-order follwing the reg review some months back. I actually rang them prior to receiving my BlueEye as I was going on holiday and I was afraid the package would be dispatched and returned by the courier while I was away, the next day I received an email from Gear4 telling me they had dispatched my BlueEye, and that I was the first in the world to own one! I also got a slip through the door from the delivery company the same day, saying I would need to pick up the parcel as I wasn't in to receive it.
Now that is service, highly recommended!