Yeah, i have JVC's top of the line deck (the MP3 one) and it does heat up a lot and skip after 4-5 hours. I drive 30,000 miles a year, and that is a problem, just buy a 12v case fan from a computer store and mount it about a quarter inch off the top of your headunit, if you want to get crazy (i did), run some 3 inch flexhose into the passenger footwell, hell my girlfriends are always cold anyway