Sturdy and such a space saver!!! It wasn’t easy to put together and some of the bolts didn’t fit. But for the price, a trip to Home Depot was okay. Also, like other reviews, get some plywood boards if you have foam mattresses. 
One other piece of advice...use a hair dryer to remove the huge stickers on the footboards. They were horrible to get off but a little heat does the trick. Even with these little flaws, this bunk is worth it hands down!