We have had this mattress for a month. No smell upon opening plastic packaging, expanded as expected in 48 hours, no problems with sagging or wearing so far. IT IS HEAVEN in terms of comfort compared to our 8-year-old, visibly worn Sultan IKEA mattress. I laid down to test it out after it expanded and fell asleep! So, it is incredibly comfortable. My husband likes a super-soft mattress while I like a firmer mattress and this has worked for both of our comfort levels. ONE ANNOYING THING, however, was that we under the impression that the gel layer would make the mattress cooler after reading how normal memory foam can be too warm but it is not cool. The temp doesn't keep us awake but we do now sleep with a fan. We have added a waterproof mattress pad, as recommended by product folks who say body sweat and other liquids can ruin the memory foam, but this hasn't made it cooler. ONE THING TO THINK ABOUT is that now our bodies are more supported but our pillows don't "work" as before. Sounds weird but probably because we adjusted pillows a dozen times before in an effort to alleviate the problems with the old mattress. Nevertheless, this is a small issue and will be easily resolved. Overall, we're getting more restful sleep, waking up less to move around, and that's the point, right?