I had this buffet the day after the buffet at the Bellagio. While it was very nice it was a tad less enjoyable then the Bellagio for me. Wynn did have a better dessert selection though which is awesome of course. The buffet is also more organized then at Bellagio but that isn't really a big deal. I recall the prime rib, mashed potatoes and dim sum pork buns as the best dinner items. So many great desserts to choose from, the crepe station, gellato,lemon meringue 'pie' (in a shot glass, still good), umm bread pudding, etc..
I love sushi so their sushi sucked.
Unless you're poor it's hard to go wrong deciding to at least try this place out, you'll probably love it even more then me.