YUM! I have been to Yolies several times and not once have I been disappointed. As others have mentioned come hungry and be prepared for a serious meat fest. No I don't mean the Thunder from Down Under show, I am talking about skewers of tasty goodness.
One thing I appreciate about this Brazilian steak house is that they don't just bring out the meats and slap it on your dish. They ask if you want it rare, medium rare, well done, etc. They explain the preperation which makes it more personal and enhances the experience.
The wait staff was attentive and never left us hanging. The plantains are sweet and delicious and besides the meat the only other thing stuff in my face. Wonderful wine list and Brazilian beers and sodas. I had one that like a fruity ginger ale that was a great way to finish the meal.
Go and try it. I thought the meats and experience was far better then Samba. A favorite stop anytime I am in Vegas.