Truth.
Which is (IMHO, anyway...) indicative of the one major design flaw of the Sparx consumer machine: There is no provision whatsoever to attach a vacuum/dust collector to the unit.
Despite the weird promo video of the Sparx unit whirring away on the kitchen counter while the kids do their homework in the background, I'm willing to wager that the VAST majority of consumers have these machines set up in their basements or garages. You know, places where they are also likely to have access to a shopvac with a 2.5" nozzle - a tool which just so happens to be tailor-made to suck fine-grained steel detritus out of a relatively small enclosed space.
Seriously. A 2.5" port in the back of the unit would (a) allow the use of a cross-grinding ring, and (b) obviate the need to replace a $16.00 filter. Why hasn't this been done, yet?
What's that? Oh, Sparx doesn't want to lose the revenue from filter sales? Fine. Then make the vacuum port an option and charge an extra $50 for a unit that has one.
I sharpen skates for several players that change their hollows based on the hardness of the ice they're playing on next - if I had a cross-grind ring and my shop vac hooked up to my sharpener, I could get done in 3-4 passes, what it takes a 'regular' grinding ring 10+ passes to do...