Pros. If you want to go with a jig, this is about as quick and simple as it gets for utility work. Looks better than the lap-dovetail jigs you can buy and will go to any width.
Soon mastered in use.
Experienced wood workers know the tails are machined, but Joe Soap wouldn't at first glance.
Cons. You need three sizes covering timber up to 30mm thick (I seem to recall). The small one copes for timber up to 18mm (3/4)