The bunk beds are very nice, sturdy wood with steel support for the mattresses for the top 2 beds, however the trundle bed is not designed well with weak materials. It has wood slats for support that arent sturdy at all. My kids have had the beds for a week and have already cracked 2 wood slats (nobody was jumping on it, literally broke from my kids just climbing into the bed or stepping on it to get to the other 2 beds while it was in use) I will need to replace those. Also the wood split where it was screwed into the end piece that sits on top of the wheels. I taped it back together with some gorilla tape so hopefully that keeps it together but Im definitely disappointed that Im already fixing things a week in. 
I took one star off because overall I love the bunk beds and I only need the trundle bed on the weekends, but if I needed it for every day use I probably would have returned the bunk beds and taken off much more than 1 star.