I just got back from a fun weekend celebrating my friends 21st birthday at The Hard Rock, and it was great!
About 14 of us stayed in 3 rooms in the Paradise (one of the new ones) tower, and the rooms were super nice. There was an ipod dock so we could blast our music, plenty of closet space and enough room to dance. The hotel staff was super friendly and accommodating, even when I needed an extra blanket at 4 in the morning.
The only dislikes about the hotel would be that the pool was closed and that it wasn't directly on the strip. And also, the shower was nice, but it didn't have any shelfs or anything, so it was really akward trying to shave my legs in there..
I would definitely stay there again, it was awesome.