I'm running 236is component front and 336im coax rear, both 6.5". The sound quality is very very good. I also have a JL 12w3d2 sub in the rear. The setup is driven by an Alpine F450 amp.
The a/d/s speakers themselves are awesome, but there's one problem you might run into. The weakness of my system is actually the car itself. BMW trunk is so well-sealed that you won't hear much melody from the sub, just loudness. Fortunately, my car comes with a ski port which could be removed to allow more bass into the cabin.
I'm also thinking about replacing the sub with a pair of JL Stealthboxes (my current sub takes up a huge chunk of space in the trunk). I'll lose the rear speakers in the process, but the thought of having a fully usable trunk space is very tempting.
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