Vulture6,
I had the old one and got the conversion and the fine jaw. I love them and I tie down to a size 22 I also tie big deerhair bugs, Atlantics and everything else you can think of..I've had no problems or complaints.
In fact, I have another well known vise that I use for travel, and I don't use it for hair bugs because it's been known to loose it's grip(very frustrating). Well, I hope this helps
VEE