First I was a bit worried about building this, but let me tell you I was able to have it all put together and ready for the fun in less than an hour. (and that was with the help of a 3 year old) I wasn't sure how this was to hold kids but I figured if it didn't work I would return it - I am happy to say this is well constructed, I have had 3 kids climbing on this at once and never had to worry about it tipping over, now we did put stakes over the wheels just for a piece of mind. Great Quality and Hours of fun