Picked up a decent Vader interior (1999 M3) for $300 this past week. The seller was a VERY cool guy who did some serious splicing and wiring to help me install the power Vaders in my non power ti.
The way he wired it up, my "heat" button now enables the power adjustment to the seats!
The passenger and rear seats are fine but of course, the drivers side left bolster is a mess. The structure/padding however is excellent and they are A HUGE UPGRADE over my stock seats in terms of support and comfort.
Not sure if I can fit the rears in my car but I'm going to give it a try!