I wasn't sure how good this mattress could be, being so cheap, but I ordered it anyway and it's really great - It's firm, not medium, but I knew that from other reviews. It's not so firm that parts of me go numb, no lumpy springs anywhere, and the build quality looks good. The 10-year warranty and 100-day trial give me a lot of faith that this mattress is going to work for me for a long time.