Not bad, a little creaky because of the metal but am hoping that will go away with more use. Highly suggest getting a firm mattress because you can feel the bars if it's not too firm. I also got a thicker mattress for the top and a 6" for the trundle since it can't be any bigger than that. This is in my guest bedroom and don't anticipate using this as a king size bed too often, which is why I went thicker on the top.