I have the 1/2" Hercules ultra torque and it has worked for anything I have needed in a professional setting.
The battery makes a good difference in performance. I have the 8ah extreme performance on it most the time but can tell its a bit weaker with a 5ah on it.
I can sharpen knives and blades pretty good but the times I've tried drill bits by hand, I ended up with dull spoons.
I got lucky and got a very slightly used drill dr with all the add on parts and a handy VHS instruction video for cheap a few years ago and it works for me. With that said...