i had the privilege of staying here since my friend's godmother owns a condo or has a timeshare or something. there is a gated entrance to get into the signature, but it's pretty easy to get in if you're a legitimate guest there. we were charged a $100 cleaning fee but divided by the 12 people we crammed into our 1-bedroom suite our stay was basically free.
our suite was spacious and really nice. 2 full bathrooms was a definite plus especially when getting ready to go out for the evening. a full kitchen also helps...we def stocked up our fridge and freezer with tons of alcohol. the kitchen is also fully stocked with a stovetop, oven, microwave, plates, forks, knives, and even pots/pans! there's even a dishwasher so you dont have to hand wash dishes while on vacation! there were also 2 beds-1 king in the master bedroom and 1 pull out couch bed...our suite was spacious enough though that we fit 3 aerobeds in our room plus a couple of random people on the floor and there was still room to walk around! having free wi-fi was also pretty cool too.
the only part i wish i could change about the signature is their location! yes it's affiliated with the MGM but to even get to the casino/restaurants/shops/bars/clubs...it's a good 15 min walk. you have to go through 3 different hallways with people movers and when you finally reach the MGM...that place is huge too! on the upside, there is a taxi line at the signature itself so at least that was convenient.
also you must take note and remember what tower you're staying in...there are 3 different signature towers and when slightly inebriated it can get difficult to remember how to get to your room ;)