Looked at getting a while back, things that put me off were that brakes aren't cheap, the in-car tv option isn't worth having if the car is older than 2004, where the rear sub frame is bolted to the body there's a chance that cracks will start appearing, BMW did a recall on this but only for cars up to 10 years old, so if it has these cracks and was never sorted it's at least a £1000 job (think its redhill motorsport or something along those lines that do the repair).
OEM rear springs have a chance of snapping, Eibach rear springs are meant to solve this problem.
Looked at several examples and to be honest none of them were as described, think a lot of sellers think their car is best out there, there's a lot of repaired M3's out there, many of them badly repaired.
All of the above made me decide to stick with Subaru's, please don't let me put you off if you really want one mate, just wanna pass on what I came across when looking at them, you'll need to have patience to find the right one, hope this helps.
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