These offer amazing sleep options at our lakehouse, but
1. Nice Sealy mattresses are too tall for the bottom...leaves sleepers with very uncomfortable head space.  I know this is because it could be two beds. 
2. Sealy mattresses are too tall for top bunk too...over the railing. We are stuck buying cheaper firmer mattresses which was not our goal for our airbnb...
3. The metal rungs could be redesigned to be flat with more foot space. They are uncomfortable to step on for sure.
4. Value for dollar is still high. Just plan mattresses accordingly. 
5. 2 men assembled 2 of these in 3 hrs. very easy they say. Plenty of time to fish after...