Relatively easy to put together. Sturdy.
Size is just right for the small space it had to fit into (less than 42"wide)
Grandkids - 3 and 5 - love it. Plenty of room between bunks and between upper bunk and ceiling. 
Doesn't overwhelm the room.
Only negative - the corners on the upper bunk next to the stairs could be rounded or covered with some sort of bumper.