Aha, a plunge router attached to a Roomba j/k ;). That page is very helpful. Hard to say what it's good for unless you're a dedicated woodwork buff. Otherwise a jigsaw seems like enough for a lot of this.
I think it can do beveled and rounded edges plus do surface cuts* like for cabinent doors. And this will cut even edges, jigsaws are trickier for curves. *(likely wrong word)