This is a great trundle, works beautifully with the Greek keys daybed also purchased on this site. Only problem is the assembly. You need to line up all the mattress support rods before one can tightenthe screws to assemble and in my case one was a smidge longer than the others so lining them up was a bear and a half! Finally ended up taping them down with painters tape and then doing the screws..
This gadget allowed us to add one more sleeping spot for our guests at our lake cabin. I used risers to raise the twin bed up a bit then used a bunk board under the mattress. It has as much support as a regular bed and slides easily underneath. It did take two of us to assemble though.