These are lovely. (we had one at the Playgroup I worked at). The children enjoyed them - can be used as a a tunnel for cars, teddies can hide under it, can be used as race track for cars to slide down, obviously can be used for standing/wobbling on, or jumping off the other side.
But....we got a grant for funding that paid for ours - as a private family, for one child - I don't think it is worth it. (but if you have the money, or want to splash out, yes they are good).