I have about 20 vises too but then I am the warehouse for our flyfishing club gear.
I tie on the Presention 4000 but at times lust for the 3000 jaws.
The first thing I did, which I think is a feature on both vises, is disable the one-way, ratcheting rotation. Now the vises head spins no matter which way I turn the crank which makes more sense to me. What say ye about that? I sometimes wonder if I missed the reason for the one way rotation.