Super fun pool! Bryan and I came here solely because of the lazy river. Downside is that you either bring your own inner tube or buy one (small for $20 or large for $24), no rentals available. An employee at the front and over the phone told us there would be $8 ones for purchase, but that was wrong info.
Since we weren't staying at MGM, we had to reserve 2 chairs for $40. The chairs were comfy and you can pick where you want to sit (shade vs. sun). After our time in the lazy river, relaxing on the chairs was great. Unlimited free water bottles and towels were pluses.
Lockers are available for rent. You can access them as many times during your visit. It was $15 for weekend pricing ($10 for weekdays, I believe). Kinda steep price in my opinion, but it was necessary to store our backpacks, phones and wallets.
Overall, we really enjoyed the lazy river and our experience at this pool, especially on a hot day. We'll consider staying at the MGM next time just for the pool!