I got my 3" memory foam topper for a new mattress that seemed to be quite firm. The topper unwrapped easily, and did have a smell to it, as all memory foam products do. We let it air out opened up for a day and then used it with no odor issues after that. The topper is slightly larger than our mattress but not so much that I would attempt to cut it down. So far it holds it shape very well and does what I thought- it softens my firm mattress. My husband is still not sure he likes sinking down into the foam but we haven't taken it off yet, so he must be getting used to it. So before you pass judgement, try it at least a week. I have extra deep pocket sheets so they easily fit over the whole thing. The only con I can say is that it makes my already tall bed 3 inches taller so I have a little bit of a hard time hopping up into bed. If I had thought about that I may have gone with a 2 inch.