I have one of those lamps with the magnifier in the center.
I use it sometimes to look at a figure, study detail or try to ID an odd bit, but not for painting.
I tried it, and you can see the figure bigger, but your hands are still the same size as is your brush. In the end all it does is show me in great detail what I'm messing up.
Kind of screws up your depth perception too, at least in my case.
Others, however, seem to enjoy using them so you may find it useful. You'll really just need to try it I think.