Very solid, no creaking bunk bed. My 9year old can sit up in the lower bunk. 11year loves the top bunk. Make sure it’s the Treva (tall) twin. It took me (the mom) 2.5 hours to use my power screwdriver to complete the build. It’s been several days and it’s still off gassing. The smell is of particle board and it’s very strong. I’m keeping the windows open all day and cracked at night to ensure much needed ventilation.