The WORK SHARP Ken Onion Edition allows (for twice the price)
-a 3/4" belt vs a 1/2",
-discrete angle adjustments (so you can grind away extra steel),
-variable speed and a roller rest for the cutting edge to ride on.

Works for those who feel it is needed, but the standard model works just fine with two angle settings. It would benefit from the wider belt, but not a show stopper.
jmho
Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".