Jeff,
Look on Moomba.com bulletin board... search for KCA-iP500 there are several posts on that from last year. I saw several complaints about how slow it reacts.. there is also a post on how to bypass some of the functions...
One option is the Harmon Kardon Drive Play.. Look around on the net there are some smokin deals on that.. I have one in my truck and it is great. I have to use FM trans on my truck, but tried in my wifes car on a direct input and it sounds great. I got mine for $20 at stootsi.com but I think they are out. look on ebay and on google. HK has d/c this model to put out a new one that is bluetooth, etc. that is $299.
http://www.pricegrabber.com/user_sales_getprod.php?masterid=18919759&lot_id=74 43493