I am looking into getting a box joint jig and found this one out the
http://www.woodpeck.com/incrajig.html.

It looks like it can cut a lot of joints and, also, be used on other
machines like the drill press, table saw, and bandsaw. This is my first
venture into this territory, so I don't know if it is something that is
worthwhile or if it is just marketed well? It sort of looks too good to be
absolutely true, so there has to be a catch.

Any opinions?

Thanks,
ray