I have the JVC KW-AVX800 so I decided to get the KS-BTA200. It works well with my HTC Touch Pro but after about 2 weeks it it started connecting and disconnecting. It don't display text messages on the screen but sounds great and everyone I call can hear me fine.
Got this at Car Toys, installed it myself. Works very well with my Voyager. Concealed it all easily, works well for music, don't have to worry about CD's anymore. Sound quality is noticeably degraded, but that's to be expected anyway. Makes calling easier, though I haven't figured all the little details out just yet.
The first one lasted a year then went dead. I decided to buy another as I liked the sound quality and the auto connect feature. The second one lasted about 8 months before it would disconnect on it's own at random. After $250 invested, I'm going to have to break out the ear bud again.