I have one, like it and use it fairly often. Sharp drills are a good thing.
I'll be honest, Duane. You can sharpen most drills by hand on a bench grinder or belt sander. There is a learning curve and you have to concentrate but it isn't hard to do. I did this for years until my eyesight caused me to look for options.
The good thing about the DD is that it takes very little "skill" to consistently produce a usable point. If you can turn something around and around with your hand, you can sharpen a drill with the DD. The consumer grade DD is not going to last in a production environment but for a hobby shop, yeah, its pretty good. It will sharpen 118 and 135 points and split all of them if you wish. It will also grind a 118 into a 135 if you want to spend the time. It will not sharpen center drills or spotting drills.
The other thing to consider is that the DD will sharpen drills down to 1/16" and up to 3/4" with the right chuck. For a hobby guy, that's pretty good. It will also sharpen all your wire size and letter drills.
I only have the 500 model that goes up to 1/2", which is fine since above that I can go to the bench grinder, but the vast majority of my drill sharpening is done on the DD. If you buy one, also buy a spare diamond wheel. Wish they sold CBN wheels; it would work better with HSS.