Great, sturdy bunk bed! The reviews were right... it does take several hours to put together (probably around 6 for us). Follow the pictures on the instructions closely or you may have to backtrack a few steps like we did. 

We put a 7 inch mattress on top and a 9 inch mattress on the bottom. I’m 5’2” and can sit up straight on both (without hitting the ceiling or upper bunk). The stairs are sturdy and seem much safer than a ladder for our 5 year old sleeping on the top bunk. We also love the extra storage under the bed and on the steps.