Anyone Using a Factory or Add-on Manual Choke?

The one I have doesn't have settings or detents so if it's on high idle I can push the knob in and it will idle down more and more as it's pushed in until it's at normal idle.

It works the other way as well, so I can pull the knob out partially and the idle speed increases with no steps in it's travel.

Of course this is because this Holley 600 has a rounded smooth high idle cam unlike the stepped type like Edelbrocks have.