Which boots were highest on that study, out of curiosity?
It's also nowhere near the price. As with just about everything else, there is always a tradeoff between price and quality. When considering price and performance, the Sparx is an excellent product for most home users, particularly those who don't have access to quality, or even competent, local sharpeners. And before you argue - no, not everyone has an extra $1000 to buy a ProSharp. No, most people don't have the time - either in training or sharpening - or possibly even the skill to use a manual machine. No, not everyone has a nearby sharpener that can sharpen a skate without ruining the profile - not even themselves. Yes, there is a lot to be said for the convenience of sharpening a skate while you pack your bag, allowing you to have good edges every session. No, the end result is not as good as other machines or a good hand sharpener. Yes, there are limitations on what it can do. Yes, it's probably still a good idea to send the steel to a quality sharpener for a refresh periodically. Yes, that partially defeats the purpose of having the machine. Yes, despite that it's still worth the money for what it delivers.