I have a Garmin 330 hooked to a 530 in a Baron, which counts as spam can,
and also a 330 connected to a 430 in an Extra, which is composite and is not
a spam can.

Both work exceptionally well, and it's amazing how much traffic is out there
that you never see, even with a good scan. There was a recent excellent
review in either IFR or Aviation Consumer on the subject.

I consider it one of my best avionics investments.