It's comfy, makes my awful mattress much better and my shoulders don't hurt anymore; only complaints are that it definitely shifts and I'm constantly having to pull it back from the other side; it's only me and I have a full-size, I've noticed it shifts even if I'm careful and just from simply getting in & out. If I get ambitious I might get one of those rug grip things to put between the topper and the mattress and I think that would help. It fits perfectly, if anything it may be a tiny bit too big. The other thing is I should have checked and it makes my mattress pretty high. It really is 3.5"-4" tall so keep in mind.  This will work till I can afford a new mattress though.