I've been hit or miss with the Hilton beds. Most of the Hamptons I've stayed at have them and they've been great.

Hilton UK needs to get with the program, though
My bed at the Hilton Olympia was like sleeping on a slab of concrete. Now the Hilton LHR is another story.

I don't think I would buy one of their beds, though. Any good, reputable mattress shop will be able to set you up with a good mattress set. What you want to do is go to a Bed Bath & Beyond or similar store and buy a top of the line pillowtop mattress cover. For a queen sized bed it will probably run around $120, or maybe slightly more. Then, go for some comfortable sheets (Jersey are my favorite in the summer, flannel in the winter) and a good comforter and you are all set.