Regarding the Edgepro vs. Sharpmaker. I think they both have their advantages, and rather than one replacing the other, that they work well together. The EdgePro is messy. Changing out the stones, scrubbing them, keeping them wet, taping your blade so it doesn't get scratched, having to clean up the area after using it makes it a pain in the rear. I use it for reprofiling, regrinding tips, stuff like that, where the speed and ease of grinding far outweighs the mess and hassle. Most touchups I do on a Sharpmaker, because it's faster, simpler, and cleaner.
I've used the EdgePro (mine is the Apex) to rebevel knives ranging in size from a Victorinox SAK to a BK&T Patrol Machete. It can't do a pure convex edge on its own, but you can grind the edge at the desired final angle, then lower the angle progressively without taking the new bevel all the way to the edge (for instance 20 per side for the final edge, then 15, and 10 [estimating here, I just eyeball it, and make a few smaller adjustments with just a pass or two with the medium stone] to break the shoulders, and for a back bevel), and use a loaded strop to smooth it out. The fact that you can fix the angle makes this very easy, and also lets you use different grits on the same edge. You can have a coarser final edge for better slicing, and mirror polish the back bevels for less resistance.
I guess you could do the same thing with a Sharpmaker or any stone, but it would take alot more time, and a much better eye, and steadier hand than mine to keep those bevels consistent.
I would like to try a belt grinder, and may buy one this summer. I have no doubt it will reprofile faster than an EdgePro, and probably give me just as good an edge after some practice.
I have to think that the EdgePro is easier to use, and just as the Edgepro is a pain to mess with compared to a Sharpmaker, the belt grinder is probably the same in relation to the EdgePro. Have to buy belts of various grits, change out belts for different grits, it'll take up more space, and leave a mess to be cleaned up, too. See, I've almost talked myself out of it already
