I found this toy at a thrift store for $5.99 and thought it was too good to pass up. Now that I have seen my son in action with it, I'd be willing to pay full price for any other discovery toys product!
He loves to be just like daddy with his perfectly sized tool box. The parts are virtually indestructible; our set has been used indoors and out and have not chipped or scratched at all. The "drill" is battery powered and functions just like a real drill. The drill and screwdriver have two interchangeable bits that can be used for attaching various parts.
Even though there is a specific goal intended by the makers, I consider this an open ended toy, as my son has put together many of his own creations using the parts provided.
If the screws and small parts get lost, discovery toys will send you a replacement pack for a small fee.
Although the package says 4 and up, I found it perfectly acceptable for my 2.5 yo, and friends as old as 9 have been really into it, so I'd say it is likely to stick around for a while!