Bought the M with relatively high mileage (79K) but it is in great shape. Handles as though it is on tracks and accelerates, in all gears. Like it has jets. Long drives can be a bit difficult (I am almost 6'2" and the seats are a slightly bit hard, but if I take a break every 2 hours, no problem. It's a fun car, always noticed (ty, the cops too :( ) but a real treat to drive. I think I like the lines of this model more than the Z4 but would love to have some of the improvements of the newer Zs -- slightly wider interior, more comfy seats, and a fully automatic top. Otherwise, it's a dream.
Handling -- taking a corner and just punching the gas is a...gas.