The trundle bed turned out to work well for the purpose of short term guests and they seem to be comfortable on it.  The bed was a bit difficult to put together and took a few hours for my engineer husband to accomplish. The only disappointment was that one of the drawers doesn’t line up well on its track and therefore doesn’t close flesh to with the frame.  Not a huge issue and it doesn’t affect the use of the bed as a twin or king.  Oh, the way it turns into a king size bed is great! Put a king size sheet on the two twin mattresses and they stay together and don’t separate in the middle when using.  I would definitely recommend.