Outer Limits 4x4 Board

im lookin at buying a bender and while i was out i came across a pneumatic
bender and still had the normal jack handle.

whilst speakin to the guy he reckons they dont sell many as its hard to be accurate?
saying the bender goes up in increments not constant flow
is this true

thought it possible to use air to get it about right then fine tune with the handle?

most of the air ones kind of spit there way up the stroke of the ram. theyre cheap and take time normally