Went there with a friend yesterday, good pool! The staff and lifeguards were very courteous despite having to close down the lazy river temporarily for some issues. There is a volleyball pool, and other nice chill pools. Seats were still plentiful for groups of 3 or under, but were scarce for a larger group. Tasty drinks served poolside or out. Around 10 dollars for a beer and 17 for an alcohol slushy.
Overall the pool and staff were good, it did feel a little overly crowded but I would expect that to change once the Monte Carlo's pool is functional again. Monte Carlo guests currently have access to Mandalay Bay's pool and MGM Grand's.
THEY DO NOT PROVIDE INNER TUBES. Bring one or buy one for quite a high price. Either way, the lazy river is less crowded because of this.