ive actually just bought an installed one on friday. the bt is good. ive had no sync issues at all, although there is a slight audio delay and it is only slight, and the call quality isnt quite as good as the sony BT kit that was in the car previously although thise was a stand alone piece of kit so that's to be expected really - It's still perfectly acceptable.
Overall, im more than satisified with the BT performance. It syncs perfectly with my blackberry 8900, displays the battery life, the signal strength, tell's me who's calling and and can pull up the phonebook and call log entries from the phone to dial ect.
It does also have an AUX input, yes - standard 3.5m stereo minijack affair. be careful if you want to make use of the USB input, there's a limit of 254 folders and 8 layers of folders. In otherwords if you have each album in its own folder thats 254 albums you can put on the card/drive in total. Which i found out after copying a thousand albums on to my portable hard drive and realising it wouldnt play 80% of them

also, the menu system is diabolical so make sure you are stationary when trying to set the thing up lol, it's not logical at all. Once it's all tweaked to your liking its very easy to use, but getting there....lol
finally, search around for the best price fi you do decide to buy it. The lowest ive seen is about £171