I've climbed in several gyms and while this gym is ok, be ready for long waits to get on any bouldering routes if you're there at normal evening hours and can't climb before the onslaught of high school students.
Also, it really bothers me that I purchased a 10-day pass with the understanding that if I didn't use it (I was new to the area and the salesman told me this because of my apprehensions that I might not stick around Nashville for long), I could sell the pass to someone else. I used the pass once three years ago and haven't been back to climb there since (awkward parking, too many climbers monopolizing the routes). Now I'd like to sell the pass, but, for some inexplicable reason and contrary to all other methods of commerce and trade, Climb Nashville doesn't allow this.
As far as I'm concerned, save your money and climb outside or put up your own training wall and climb there. It's just about as cost effective.
Pros: bouldering and sport routes, other classes
Cons: parking, always crowded, crappy management