Quality is pretty good and overall good value for money. The trundle pulls out smoothly - but because it's on wheels it moves around on hardwood floors when in use. The trundle is fully detached from the bed; it's not attached to the main bed with rails etc., it just sits right below. It doesn't close completely flush against the main bed - there's a small gap between the trundle drawer and the frame of the bed but not too noticeable. I would describe this bed as good not amazing. Was a lengthy assembly process but all parts fit together once we figured it out!