premium stringer 3600

I bought an used Pro's Pro Challenger machine almost a year ago how I can stringing mostly for friends and myself, but I think I will outgrowing this machine in the future. I hope during the first year I reaching a hundred of racquets, and this year will be better, maybe rising to 200-250. I...

ok so, I am going to buy one of these two stringing machines. the Penta costs a bit more and the only extra feature I can see on it is the diamond dusted clamps, and I can't tell if it has a ratchet like the Challenger I. Is "diamond dusted" a real worthwhile thing, or is it meaningless jargon...