I had one in my Performa 6220CD. It was (and is) a great TV tuner, with a cool remote control and everything. We used it as our TV for several years, and even taped shows to QuickTime using Apple's excellent System 7 app. It's still in use by some friends, and works great.
I believe the Performas released late '94 and early '95 are your best bet.
I wish Macs still had this feature. I tried a Formac TV tuner card in my G4 tower... man, was it cruddy.