Exactly like the ones in Vegas, I saw no real issues with this store or its products. Most of the bad reviews seem years old and in comparison, I didn't notice any smell or anything dirty or wrong with the store or the employees.
My friend and I came to stock up on water and snacks for the room and I'm glad this was somewhat close to the hotel. We were able to walk here from the Radisson Phoenix North.
We did poke around some of the other offerings and the store seemed pretty well stocked. Just don't expect any name brand goods here, most everything is an off-brand, but that's exactly what you should expect of dollar stores.
In any case, no issues from me except a bit of a wait in line.