The spa itself actually exceeded my expectation. This is a great idea to rejuvenate during the day after a series of bad decision makings the night before. It's a relatively clean and organized space for you to (attempt to) wash away your sins, hydrate and perspire all sorts of toxic you had injected yourself with. I really enjoy the place but found it a bit undersized and crowded. Keep in mind, you're in Vegas so regrettably you share the space with all sorts of characters (naked).
The shower is equipped with Lather products and probably has the most room per customer compared to the rest of the facility. It has all the basic features you'd expect from a spa, from the hot tub, sauna, steam bath and massages. Instead of a cold tub, they have couple cold mist/rain shower station. The sauna has a large glass front which may upset my Finnish friends. The cold towels though is a nice touch. However the one hot tub is small for a spa shared by Venetian/Palazzo. I was slightly discouraged by the size of most areas given that one has come to expect generous space when staying at Palazzo.
The dry/resting areas are adequate even though choice of refreshment is very limited. People raved about the heated chair (all 6 of them) around the TV/massage waiting room. I personally found the lounge chair/bed much more relaxing in the quieter, adjacent room.
Overall not a bad idea at all and really for $25 I think this is pretty good value and solid way to start your second day in Vegas. I didn't try the massages because I am pretty sure it won't blow my mind but the spa itself is on-par with what LA K-town has to offer. Would have been better if it was less crowded and has even better selection of beverages. Might have to check out the other spas in Vegas to compare.