Secret Pizza was one of the places we were looking forward to on our last trip because many people talk about it, and the reviews are awesome. It's located on the third floor of the Cosmo with other restaurants (I think it's the level with a pool table on it), down the hallway with all the pictures.
There was no line and we were able to get our pizza right away. Each slice is preheated, and one of the disappointing things is that both of our slices were overly salty. The slices were good, but no where near the hype. And not anywhere near the quality of an authentic slice from NY. I think the slices were $5-7 each, and beer was $7-8.
The service was OK and there is virtually no seating. The atmosphere is nice (arcade games, bar top seating, etc). But the pizza was just OK. We found the slice at Flour and Barley (at the Linq) was much better.