Conclusion: When I purchased this unit I had done quite a bit of research on this type of product. One of the negatives that showed up frequently was dissatisfaction with the menu system and lack of ease of use. I do agree the menu system leaves some to be desired and it does take some time to "figure it out" with time spent reviewing the owners manual. Once you do get it figured out however, the rest is nearly perfect.
Conclusion: The kca-bt300 bluetooth unit works great, although quite a big unit, i had enough room to install it in behind the glove box, i am using this with my kenwood dnx 5160, however, i would strongly recommend purchasing the kenwood model 6160 because it already has built in bluetooth, good value for the money and excellent shipping to canada, very happy this purchase/product
Conclusion: It connected to my HTC Aria phone within 30 seconds of starting it up for the first time. The only problem is that it can only answer and end calls, while other phones support using the radio interface to to dial phone numbers and store a phone book.