My wife and I were in Vegas for a business trip and brought our gear with the hopes of getting a gym day in. We tried NCC and it did not meet our needs. The gym appears to focus on strength climbing as opposed to a good balance of strength and technique. Every route we climbed was oriented vertical and felt more like climbing a ladder than a route.
My biggest concern with the gym was that after charging the day rate and signing the log there was no orientation or safety check before they let us on the wall. There should always be a safety check even if you show up with gear and look like a climber.
On the positive side; the gym does seem oriented well for kids / beginners / UNLV students who would take a class before starting without much climbing background. If you just want to work up a sweat go for it.