Just received my (US) EyeTV Hybrid in the mail. It works wonderfully on the MacBook Pro. On the Power Mac it seemed a little less fluid, though my processor is always doing other things.
I used it to watch OTA HD with an antenna I had from an old piece of HD-Tuner kit. I don't think it's a very good one, but it works well... almost no skipping / problems. Quality looks good.
The Hybrid is a little stick. I'm a little concerned because it seems like it could be ripped out if someone tripped over the cable - if this happened, god knows what would happen. I'm guessing it'd tear out of the MacBook pro before doing damage to it, but who knows what would happen to the stick itself.