Another vote for the EdgePro (I have an Edgepro Pro) - I take it to a lot of comps as I offer (almost) free sharpening to MABA members, so I've sharpened a lot of blades. Best thing about the Edgepro is that it's repeatable from sharpening to sharpening.
Biggest issue with the Chef's Choice sharpeners is that the angle is fixed at 25 degrees which is a little steep and higher than most factory grinds. Henckels & Wustofs come at 24 degrees, Messermeister's come at 22, and most Japanese knives are around 18-20 degrees (Shuns come at Eighteen. Using a Chef's Choice on a Japanese blade is the fastest way to ruin the edge.
Those angles are the ones that are reference marked, you can go anywhere from 10-24 degrees.
It depends on the hardness of the steel and the use of the blade. Good Japanese blades do fine all the way down to 11 degrees, just don't chop through bones with them.