As with all things Vegas, everything is just flashier. Apparently this also applies to airport lounges. We had a layover here on our way home to Hawaii and my husband had received a promotional free access (otherwise it's $50/person if you're an AMEX holder), so we decided to give it a try. It's right by the D4 gate access and even the entrance alone is out to impress (see picture). It feels more like an entrance to a club or nice restaurant rather than an entrance to an airport lounge.
Entry was easy and we felt welcomed. Decor tastefully done in modern style. I love the individual seats that were nest-like and gave lots of privacy. The food was delicious, and the cocktails superb. My husband brought up a good point, though: Vegas doesn't seem the ideal city to have this lounge. It's not a major hub, and if you really had more than 5 hours to kill, why not place your luggage into one of the airport lockers and go to the strip. The lounge closes at 12am so you can't really use it as a hotel to sleep overnight, go to one of the numerous places on the strip instead.
That being said, I do appreciate it for what it is. An extension of Vegas extravagance.