Re: Rotary or not?
One thing about the Dan-Vise though, if you're going to use it to tie itty-bitty stuff (20's and smaller), resist the urge to put the hook at the very tip of the jaws. I cracked one corner of one of the jaws off by doing that. I think Gordon mentioned that the same happened to his, at some point.
Just put the bend of the hook back about 1/16" into the jaws and you should be fine. Even if it does happen, you still will be able to tie small stuff. The small nick out of mine isn't enough to really interfere.