Our son had grown out if his crib, but yet he wasn't quite ready for a regular size bed.  We found this and it is perfect for him!  He loves it. You need to assemble it, but it took maybe 3o minutes to do, used the crib mattress in it and it fits perfect!  The partial side rails are great, because they give him that added feeling of security as he rolls around at night.  We love it, thank you!