I could be wrong, Mark, but I always thought that Porter Cable was more-a-less the standard for dovetail jigs. I haven't used one, but watched a demo of one at the Woodworking Show in T.O. As far as I know, when you make dovetails, you are making both adjoining pieces at the same time...one piece sits vertically in the jig and one horizontally with a stagger to it(half the pitch of one dovetail to the next). Both are cut at the same time, as would be done in the PC jig...I think that Keller jig you would make each piece separately by the looks of it, something to consider. As I said, haven't used one before, just an observation but I don't think you'd go wrong with the PC.
