I received this only yesterday and got it installed no problem. The player doesn't have an internal mic, you have to wire up the external mic(included) which I was planning to do anyway, but just a word of warning to those who don't want the bother.
The last model (Bt50u) had a2dp (bluetooth music streaming), so I didn't check if this one had it as it is the updated model so obviously it would also have it... well so I thought, they decided for some reason not to include it which is annoying as it was a feature I wanted and the hardware is there for it, they just want us to get spend more money on another cd player which made me lose alot of respect for kenwood.
The user interface is abit complicated, I'm a quick learner with technology so it wasn't a major problem for me, but if technology isn't your thing then you'd be better looking elsewhere. The screen is good and can be customised e.g. you can get it to display the time on the top line instead of playing time which was a nice feature, but as others have said it can be hard to view with the sun shining. You can invert the display colours (e.g. bright writing on dark background) which may improve things but I haven't had a chance to see the results yet.
The phonebook was synced across from my phone perfectly, and the microphone quality is decent. The usb folder browser is also good and you can easily move between folders on your flash drive.
It's a good player but unfortunately the user interface isn't user friendly and the a2dp is a definite downside, so it depends on the buyer if these 2 negatives will be a problem.