Overall nice place. The room was clean and well equipped - there were enough dishes, pots, pans and silverware to prepare food if you like. We ended up eating breakfast in our room most days.
The third tower is the farthest from the MGM Grand, but the difference in distance is pretty minimal - maybe a minute or two walking time. The benefit of this was that the lobby/public areas seemed to be a little bit quieter than the rest.
While each tower has their own pool, the pool/hottub for Tower 3 was closed most of the week. Not a big issue, as you could still use the other pools, more of an FYI.
The gyms in the towers were pretty well equipped, and they were more than adequate for working out in.
The only minor issue that we experience was that the room AC seemed to run warm at night time. I'm not sure if this is a central control thing, a result of the sun beating on the hotel all day, or something else, but if you like a cool room to sleep in, this may be an issue for you.