We've booked through Luxury Suites International (LSI) for two separate Vegas getaways. LSI owns floors of The Signature and you need to read what you're buying. Most of the complaints about LSI stem from what I can only figure are people who saw a price and immediately booked without reading. LSI offers deals as low as $79 for rooms in Vegas but the catch is you don't have all the same amenties as a regular guest. You have to call LSI in order to fulfill requests. I didn't have a reason to call them on either of my trips. If I wanted or was worried about all the amenities, I'd pay the extra $100 a night and book directly through The Signature. My husband and I stayed at The Signature both times we went to Vegas and we had very clean, large, junior suites both times. We were on a low floor because we didn't pay more for the view. Again, read about the rooms and read about the reservation and amenities.
The only reason I gave them 4 stars and not 5 is because I think it's a little ridiculous to charge $25 to cancel no matter how far out the reservation is. Same day or even week...sure take $25. But a month? Kinda lame.