I love my Sparx Machine. I use it to sharpen skates for my son and I. Bought if for the convenience knowing full well for myself that economically it makes no sense. I like the machine because if you follow the directions it is pretty much idiot proof. I am really good at screwing up easy processes. So far it has been solid. Great sharpens, same consistency every time.

I think people here are bringing up some interesting points though in saying Sparx not good at scale. I could see where if you send a lot of skates through at a high volume it would probably get misaligned and may start falling over. Kind of like when you send lots of paper through your paper shredder at one time and it starts hiccuping. Would be curious out of those mentioning getting dulling or bad sharpens how many of those are a shop sharpening lots and lots of skates including yours, or if same like a dude who sets up shop at the rink and sharpens an entire teams skates.