This mattress is really great. It is firm enough that I do not sink into it, but it isn't hard either. It is thick enough that all of the new sheets fit it too. I hadn't had this brand of mattress before this one and I wish I had tried it sooner. Other mattresses I had in the past were always too soft. This mattress being firm is going to help my back pain and I'm already sleeping better. I am sure that it'll hold up for years without giving me any problems. Disclaimer: I was given this mattress for free in exchange for this product review.