My party group (6 of us) and I have gone to the REVIV in Miami and we were impressed and became firm believers in IV therapy, so we decided to checkout their Vegas location after a day of partying at the dayclubs. We walked in and we were told it would be a 30-45 minute wait, so we decided to get some snacks beforehand.
There was only one nurse at the time and she seemed flustered because she was slammed and there were technical difficulties with the computer. We all received the MegaBoost ($149) and hung out in the back while watching TV. The receptionist was accommodating and brought us blankets and bottled water. The boost wasn't as uplifting as when we had in Miami... but we were all able to sleep well afterward.
Our experience wasn't bad, but it wasn't as excellent as the time when we were in Miami. I would probably come back again the next time I'm in Vegas only if I were super hungover.