Not all systems are created equal, I tried many systems over the years with mixed results. Then came the sharp maker, and I was sold on that system. I can and do freehand, but if given the choice I would prefer the sharp maker. I am now seriously considering the wicked edge system. This is coming from one who makes knives.
With that said I will set the primary edge bevel on a 240 or 400 grit on my Esteem 2X72 free hand. If I had to I could set that bevel with the sharp-maker, or my easy lap diamond, but the on the belt it only takes minutes.