am loving my new Beautyrest Black L Class extra firm mattress and boxspring. It is so comfortable. To start off with, I was very impressed with the delivery when I saw it. It is a very attractive looking mattress. I love the outside edges of it. Very sophisticated!! I got this mattress in a king size and I am overly happy with it. It appears to be very well made. I did a very thourough lookover of both the mattress and the boxspring. Everything is nicely stitched together and it feels very sturdy with the materials that were used for the bed. The fabric is very soft to the touch and is high quality. It will not tear easily. I think this mattress can take a beating. Upon putting the sheets on the mattress I noticed something that I have never seen in any other bed before. Tucking in the top sheet between the mattress and the boxspring, there is a anti slip coating on the top of the box spring. I LOVE THIS!!! I hate it when the mattress slowly starts to slide off of the boxspring after continued use. With this coating, I don't have that problem!! This was very well thought out. It also helps to keep the sheets tucked in and not come out during the night. It's a very nice added feature. The sheets fit nicely, although to get a perfect fit, I would prefer to use deep pocket sheets. Now for the comfort of it. Mine is an extra firm. This is perfect for me. It is quite comfortable. My daughter recently had back surgery so she has been sleeping on it and she loves it more that her own bed. She said that it helps to keep her back more aligned which keeps her more comfortable. "keeps her straight" is what she says. For me, I notice a big difference when I wake up in the morning. I don't have the aches and pains that I usually have with my other mattress. I would suspect that is due to the extra firm comfort foam and the t3 pocketed coil technology. I have an easier time getting out of bed. I wake up feeling refreshed which means that I am getting a much deeper sleep.