I've been to Society Cafe twice, once solo and once with the fiancee.
The prices are outrageous. You'll be stuck with an $8 orange juice in a short skinny glass and a $9 side of bacon if you're not careful. We both left frustrated, having spent at least $30 more than we were expecting. The entrees were good, but the only thing I remember now about Society is the surprise bill.
I know that Encore is a beautiful property with lots of amenities, and that the people who can generally afford to stay there can also afford to overpay for staples. So if you're not one of those people, steer clear.
Short story shorter: left hungry, paid $60 for two lunches, had to deal with a disappointed finacee in Las Vegas (which cuts into my gambling time!)