OK, here's a comment from a somewhat satisfied user. My kids do enjoy using this set, but like all art supplies the popular colors run out fast.
The box set is HEAVY. I wouldn't let my 8 year-old (granted, not a burly child) try to get this set up herself. Not great construction -- pressed board, sticky drawers. Try carrying by the handle and the side of the box it is attached to bows out ominously.
Is it a lot of stuff for $30? Yeah, I guess. but the quality of the paints and pastels isn't that great, the brushes are for carp, and if you have any real interest in getting art supplies for your kid, you can probably have a lot of fun at an art store shopping with your kid and get out for not much more.
Also, talk to the elementary school art teacher about the best place to get supplies (or if your district has cut Elementary school specialists, go to the high school).