Sparx has a commercial offering now with a beefed up motor for additional volume (>1600 sharpenings a year). Less than that and the consumer model is deemed sufficient. They also offer an extended warranty for repairs if you need that type of assurance. https://www.sparxhockey.com/pages/commercial-homepage
Although the Sparx is skinned in plastic to make it visually look like a consumer product, it's shipping weight is just about 50 pounds. There's nothing flimsy or cheap feeling about it.
A grinding ring lasts 320 cycles, which if you average 4 cycles per skate, equates to 40 pairs.
colins