I have the corded model, and quite honestly, I can cut the hinge slots just as easily with a #11 blade. I started going back to the #11 blade when I could not get the slot machine into the areas I needed (end aileron slot ) due to other things being in the way.

My slot cutter has been sitting in the box for well over a year now. IMO, it is a nice "GADGET", but not really needed. The money can be better spent on other things (CA, covering material, etc )