Day 1: I am blown away. This mattress topper is a 10/10. I ordered it because I recently changed from a standard spring mattress to a memory foam mattress. I love my mattress, but it's a bit thinner than the spring mattress was and I missed the height. I also found that the cover of the memory foam mattress was stretching out and thought a topper might alleviate some of the strain on the mattress covering itself. So in any case I found this VERY affordable mattress topper and ordered it on impulse. I got a little worried when some reviewers said it was too soft but I rolled with it. I'm glad I did. Unpackaging was a breeze. Less than an hour to expand. No weird smell as some reviews indicate. I did however give it a spritz of my favorite fabric freshener just because that's a bed-making habit of mine. After a very restful hour nap, I can say with 100% certainty that this is an awesome purchase. The firmess to squish ratio is awesome. The added height makes my fitted sheet fit soooo much better with less slip.Now for the disclaimer: Foam. Is. Soft...... Foam. Is. Not. Firm. But this is the least soft foam I think I've ever laid on, amd that is a GOOD thing. A lot of foams have too much gove and you end up being swallowed alive. Or they are so soft that to get out you literally have to roll out because its physically impossible to sit up. But this is just right. I am VERY pleased. I will update after 1 week.SAME DAY UPDATE: okay I take back the no smell thing. Theres a bit more plastic smell than I thought. It will need more time to breathe than I thought. Not overwhelming though. Still workable.A year later and it still feels great. Moved in with my partner and we purchased a cal king size one to put in our bed. The full is now a spare bed (though our cats think it belongs to them lol). Cal King size gets the same rating as the full. Still fits well, the smell dissipates quickly, BUT the larger sizes will take longer to decompress and fill out. Keep that in mind. Don't be discouraged if it takes a while. Open it up early in the day, mist it with water or fwbreeze as it helps it unravel, and by night time, you have the most comfortable bed ever. I will say....I do not recommend using this UNLESS you use it with a fitted mattress topper/protector. Having the extra squeeze from the mattress protector keeps edges of the topper vs the edges of your mattress less noticeable. So I strongly strongly strongly recommend buying a fitted mattress protector with a slight quilting to make this topper even better. My partner and I love it.2 year update: this topper is holding it's own! We still love it! The cal king is admittedly not a perfect fit, but it is extremely comfortable. I stand by my statement that a fitted mattress cover helps HUGELY in squishing the edges down to hide the fact the topper is slightly smaller than the mattress itself...which may actually be a mattress problem more than a topper problem. The full size one fits much more flush and it is still very comfortable as well! Our guests always love it! I've come up will a couple disclaimers:1. It will never fit completely flush with your mattress. (Kind of already stated)2. Cats seem weirdly drawn to clawing the foam? Doesn't apply to everyone purchasing, but worth noting.3. The holes in the topper are not completely punched through, and of you attempt to put your finger through them to open up the airway, you may make a much bigger hole than you want.4. Can't say it enough....foam is foam. It is not as stiff as a spring mattress. I like this, but my partner amd I have both agreed that a memory foam mattress PLUS a memory foam topper is a bit too soft sometimes. We will probably convert to a firmer mattress (but keep this topper) to balance it out.But 2 times purchasing this on 2 different sized beds more that 2 years later and we still don't regret this purchase! Recommend 10/10!3 year update: Found this review while looking for a product I previously purchased and saw that I had purchased this 3 years ago. I still love it very much, and the foam does not seem to be giving out at all. I am 190 lbs and my husband is 6'8" and 260 lbs. So.... we are not small people! And yet I can say that this topper has held its own with little noticeable wear and tear. (Except for where the kitties got over zealous and scratched at it). We still have the full bed set up as a guest bed and it's doing great as well. I still stick to what I said about it being foam though.... It is soft. But we love it still 3 years later!