Recently installed the 4400 in my son's Envoy....very impressed with it....it blows away my Alpine interms of speed between menus/sources, as well as Ipod integration (which is his primary use) very nice screen quality with far less glare than my Alpine...he paid about $350 new on Ebay. If I can get a good lead on a console I can cut up..., I might go Doule Din, and will go with Pioneer ...(It would be my first non Alpine headunit in all my vehicles in over the years since early 80's)
bottom line, the Pioneer unit (for the price) is very good