Yesterday's nap and last night's sleep were the best rest I've had in ages. Firm but cushy, this mattress topper is amazing. I feel so much more comfortable in bed. Sure, my 6-year-old cheapo mattress is sagging, but this made it so much better. It comes in 2 pieces-- don't be fooled by the roll of foam that says "3" full" on it. The other 1.5" comes from the cover. It was quite amusing watching the foam expand in the middle of my living room-- be sure to clear a big enough space! The foamy smell didn't last very long at all, and wasn't very strong, but I let it air out for the recommended 24+ hours anyway. Added to my regular mattress (12" deep), the total depth is still less than 18", which means I can still use my old sheets, which is a big plus.