We read many reviews from multiple sites before deciding on this sand box. (Also, Wayfair had the best price by far.) My parents bought this for my daughter's 2nd birthday & wanted one large enough so my 7 yr old could play with her. They both fit nicely. 
We put this together on our flat patio, including the liner. It seemed to be a lot easier to properly tighten the screws, as not to crack boards. I highly recommend leveling out the yard or raking for stones, as the liner is a thick piece of plastic sheeting, with drain holes drilled in. 
The wood is a nice color & smells how cedar should. We will be sealing it before winter, as others have recommended. The cover is a piece of mesh designed to keep animals & pests out. We bought a $5 tarp for the rain.