Love our new trundle.  Assembly was around 2 hours.  Instructions were adequate but would have been a little better if the step by step had been written out instead of just pictured. We didnt have a real problem, but it could have been made simpler.  Word of advice,  dont tighten down screws until youre sure its correct.  Detail is key.  Appears to be good quality.  Will be used by guests  Grandkids, so time will tell. My husband said it is very comfortable.  We used an 8 mattress on top  6 inch on bottom.