I have the AVH-P5900DVD and I love this Pioneer. I've also installed the BlueTooth phone/music module and it was easy to install and is performing excellent. I have on order the USB music module (instead of the 12 Disc CD Changer I was going to get). The 4000 seems to be an excellent 2 din fixed screen alternative. BTW, using the stock speakers with the Pioneer - wow, what a difference it can make. Of course, I don't blast my music very often.