It is a bit of a pain to put together and by about half way through installing the mattress slat's you will be questioning your decision! However it is a well put together bunk bed and the ability to convert it into 2 twin beds is nice. The assembly instructions could do with a revamp but apart from that its a great bunk bed. We put 6" mattresses and toppers on both bunks and they were comfortable. The top bunk is a bit of a pain to make but that's one of the joys of having bunk beds