We purchased the Serta Brand Cobee Mattress only Twin for our daughter. This was a mid priced mattress, a great value for the price. I was a little worried at first, event though I know Serta makes great products, I was hesitant because of the lower price. My daughter is now 12, and has been sleeping on this Serta for over a year. It is still offering support, no sagging and she has never complained of being uncomfortable. The outside quilting is still intact, no threads have come loose, no "pilling" of the fabric. She has spilled a glass of water, we let the mattress air dry, then put a towel under he sheet for a couple days to finish absorbing any liquid. The mattress handled this without a single repercussion. Even after the water, there is still no sagging! I was pleasantly surprised at this! This is a mattress that can stay with her for years, good quality stitching, firm upholding springs, as well as a good nights sleep! This is a mattress I would recommend for anyone from a first bed for a toddler to and adult who needs a twin sized mattress. The price cannot be beaten, and it comes with the Serta guarantee.