I'm generally not a big fan of chains but Grimaldi's is one of the exceptions. We were fortunate enough to visit the original location in NYC a long time ago and are happy they now have locations all over. The location at the Palazzo has a great staff and the food is always very good. The restaurant is very open and spacious and they don't jam the tables together. They go above and beyond to make sure you are enjoying the dining experience.
I always enjoy the annual birthday large one topping pizza. I also like how they offer to serve you your first slice of pizza. Their desserts are awesome and homemade. The entire staff seems to be entire is staff is super friendly and engaging.
The bottom line is Grimaldi's provides great food and atmosphere at a reasonable price.