I really enjoyed myself at the Wicked Spoon. For comparisons sake, I also went to the Bellagio's buffet for dinner. We dropped by 8pm on a Saturday to find a long line to get seated, ended up waiting for almost 50 minutes. Adult dinner was $41, children was about $27.
Wicked Spoon has the standard buffet fares like prime rib, pastas, etc. Where it differs is presentation and "speciality" items.
Some of the exceptional highlights:
-BIY Mac N Cheese bar. Delicious. Various meats (including shrimp) that you could add.
-Pastas and whatnot served in miniature, single-serving sized pots. Uber cute.
-Variety of ethnic foods: Mexican, east Indian
-Fun arrangement of desserts. Gelato, macarons, and exceptional cobbler among my favorites. The custard boob thing was definitely the dessert.
The cons:
-Sushi was not good.
-Seafood selection wasn't particularly big or tasty.
-Getting seated in one of the U-booths was a PITA.
Wicked Spoon has a more upscale atmosphere than Bellagio's buffet. It definitely feels more special and "Vegas-y". Between the two, I'd send you to Wicked Spoon if it's your only buffet visit. Highly recommended!