I only go for the all you can eat sushi. AYCE sushi, tends to say "it's going to be cheap, but you'll get your fill at least" Prince is by far the best AYCE place. The rice is proper - it has never been warm for me (the worst part of AYCE). The fish is great tasting. And the cooked food is great. They're the only place I know that lets you have medium rare beef - which is excellent. Their beef tataki is excellent as well.
Prince is just a step up for all AYCE. It's probably better than most non-AYCE sushi places.
You know, some people will say that "Chinese run AYCE sushi places that are poor quality" but Prince shows that is only a stereotype with no substance. In fact, the ambience, decor of Prince is top notch and it has a nice place. The servers, they use to be kind of mean (yet extremely efficient) but they have cooled down for the past 3 years.
Over all, for the best AYCE experience in the GTA, I think prince is up there.