I would definitely go back when I am back in LV. First, you must realize, the name appropriately describes the services you are getting. This is not a spa or salon, but exactly what the name says, a quick place to get a mani/pedi.
We were staying at Wynn and I didn't have time to get a mani/pedi before I left for vacay. My nails looked awful and I needed to get them done quickly without spending a fortune at the salon at the hotel. I found this place on Yelp.
It is not a large place, but they make it work, and all of the techs there were very professional, accommodating and friendly. I got a pedicure and gel manicure and they looked exactly as they would have looked if I went to the salon at the hotel.
My tech also gave me great advice on things to see and directed me to some "non-touristy" places in the area that were definitely worth the trip, that I never would've known about.
All in all, it's a unique concept and you'll leave there with a good experience and professional mani/pedi.