I've been dying to buy one of these toppers for a while but since i was in the process of moving I had to wait. The order arrived well packed and there was very little smell as some other buyers have reported.Unfortunately I didn't have the full 12-16 hours that's recommended to allow the topper to regain it's shape but close to 10 hours. My mattress was too firm so this topper is excellent and I have to say I've been sleeping far better since using it. The topper has turned my bed from firm to perfect support and I actually think this is probably even better if you have a firm mattress.The only slight annoyance was that they didn't have size 150cm x 200cm which is the mattress size in Spain but I bought the King so there's a slight overhang. Nothing major and you can't see with the covers on top.I'd highly recommend this to anyone who struggles to find a comfortable sleeping position or just someone looking to refresh a mattress. 5 Stars!!