Can I offer an alternative?
Dovetails jigs are great, aren't they? But they are a pain too.
Years ago I had a wolfcraft jig, it was ghastly. Then I bought a Leigh. It produced perfect dovetails once I'd spent a morning working out how to use it, but it sat on the shelf for 364 days of the year.
If you are looking for a production jig, fine, spend lots of money on a good jig and I'm sure you will get the benefit of it.
But if you are a hobbyist and are understandably in awe of some of the dovetail work seen (like the work of Rob Cosman and Tony here) then I urge you to be inspired and encouraged rather than daunted.
For a fraction of the cost of good jig you can buy a world-class dovetail saw and, whilst your first efforts will not be excellent, you can spend a day practising and by the end you will have DTs you can show to people. You'll have a learning curve with a jig, too, I can assure you. And the whole process will be MUCH more satisfying.
The other avenue to explore, and this is how I do mine, is to use a bandsaw. The method is well-documented in Mark Duginski's Bandsaw Book and I have made a couple of improvements myself, which I wrote up in GW a year or two back. You get most of the flexibility of hand-cut DTs with good production speed and with minimal setup. And the best bit is (assuming you have a bandsaw, of course) the financial outlay is approximately nil.
Something to ponder, anyway.
My 2p.
Cheers
Steve