I'm going to be the sole dissenting voice in the wilderness...
I use the Vador jig. The design, like most jigs, is similar to the Bitz but it's injection molded plastic. I have a table of twelve of these jigs and used them pretty frequently when I had a small arrow business. No problems.
I've tried a Bitz, got it used somewhere, but I didn't care for it. The Bohning Classic nocks I use won't fit into the nock receiver unless I drill it out.
Glue sticking to the clamp, I don't use so much glue that it squishes out that badly. When I was learning I did and it pops right off the clamp, no worries.
I don't adjust the jigs with a hammer and a chisel so I don't see any reason why they won't last for a couple more decades, they've already gone through one.
One Bitz clamp costs as much as one complete Vador jig. The math was easy for me.
As always, Your Mileage May Vary.
Guy