My 6 year old daughter absolutely loves this! I had purchased another bunk bed for another room and had to place additional wood slats to support the bunk bed but these boards seem much stronger and there is an additional support beam down the middle of the top bunk. We have bumped our head on this a few times but it's a small price to pay for that added stability. I used 6 inch foam twin mattresses for both the twin trundle and the top bunk and an 8 inch foam mattress with a low profile box spring.