We went to the one at the Luxor, and it was great. We tried a couple, and ended up getting half pink/half blue. Can't remember the individual flavors but with the shot of cotton candy vodka it tasted like...you guessed it, liquid cotton candy.
32 oz for like $14, refills for 10-11 bucks, solid deal. Can't go to Vegas without getting one, and definitely worth the inconvenience of carrying it around day after day to fill it up since all of the daiquiri places will refill them. This is one of the tastier places I think though.