I have a sharpmaker, EdgoPro Apex and Professional and let me tell you - there is no comparison. With the 204 you have a choice of two grits and two angles. The EdgePro series gives you 6 grits and any angle from 10 to 30 degrees - up to 180 on the Professional with the scissor attachmenet.
Metal removal? I've used my EdgePros is reprofile my Busse knives - no problems at all.
Sharp? My knives will do all the sharp tests - push cut cigarette paper, slice a free falling sheet of paper, cut a coke can in half. Yeah, they're sharp.
Cost? The cost of an Apex is about the same as the cost of a decent knife. A totally worthwhile investment.
Hope this helps.