We bought 2 of these to furnish a guest room that we planned to use to house exchange students. We wanted them to have separate beds, but we also wanted the flexibility to make the beds into a king when we use the room for adult guests. These fit the bill. They were easy to put together and are fairly sturdy. Because the lip of the frame does come up over the mattress, we can easily push them together and use a connector set to make a king. No huge gap. The only down side is that the low lip allows the mattress to slide a bit when used as a twin. It's not a problem -- just something to be aware of.