I haven't been to Rio or PHo's Diamond Lounge yet but: Flamingo's is the smallest and worst Caesar's is the largest and best When I say worst, I don't mean it's necessarily bad. Paris is 2nd best and Harrah's is 3rd. Caesar's DL is large yet still gets a line. Harrah's is the most hidden (no signs) and is actually large as well but with nice décor. I'll check out PHo today and maybe Rio. Another note: when you pay no resort fees, you have no wifi. If you have wifi hotspot on your cellphone, it's faster anyway. I run my "hacked" Fire Stick and laptop from it with no issues. The $100 vouchers have to be used the same day and at the same venue all at once. This means if your cost is $50 at a restaurant, you can't save the extra $50 for use elsewhere. Me and wife both are Diamond so are using both vouchers for Sterling Brunch which runs $85. If you are going to use your voucher, that's a good bet. From what I see, this makes Caesar's properties my go to spot for play for now on. I don't see the benefit of play at MGM since here, I start high and can remain high. We've already booked Atlantis as well. Caesar's will get my money. edit: I must add, the DLs don't skimp on drinks. They are strong and quality. My wife got a Mudslide and Long Island Iced Tea and I got an Adios MF and Long Island Iced Tea. Service is top notch.