I ordered this over the weekend and just got it today, very fast shipping. Installed it and started to use it, those that I have called cant tell any difference between talking on the phone and the hands free though I would suggest to make sure your talking at the mic and not away from it. I have a HTC EVO 4G thru Sprint and it had no issues syncing that I have seen so far. if I can I will update if I have any issues to talk about.

Have been using the KCA BT300 for about 6 months now. It was easy to install.
Good things: easy install, good sound over the speakers

Bad things: Microphone is a bit weak as many people that I talk to have difficulty in hearing me. phone book is a bit hard to search for contacts, doesnt seem to work with text to speach with my blackberry.

Really easy to install and works really well, definitely recommend.

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. Excellent sound with OEM speakers, love the gps, just put the bluetooth in for my iPhone and really love it. I would definitely buy a newer Kenwood version of this product in the future.

This works great, easy to hook up and it's very nice to have everything on the head unit.

It connects iPhone 4 and iPhone 3GS without any issue, instant on. Very realiable, havent had any trouble with it.

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

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.

Product was easy to install and setup. Works great.

This is very user friendly. You just plug it in. It great to use with smartphones. I use it with a kenwood ddx6019. It downloads my contact automatically, I have a iphone4.

its a good product easy to use once its setup

This item was easy to install and set up. It has performed for over 6 months with no problems.