Its not that bad Dan, 6 cap screws to loosen approx 1/2 to 1 turn, slide to where you want then tighten them. Certainly easier on a manual if the dia difference is smallish but it takes quite a bit of winding on a 250mm dia chuck if you are going small to large or vice versa and even more if changing external/internal jaws, mix in some swarf to the manual chucks scroll and its a real PITA. The Hyd chuck beats it hands down for both these then you have the big advantage of a button press to open and another to close
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Hood