Only real gripe I have with it is that after each pass the Sparx has to "home" itself. I figure this is to register the pass that it just took and apply that to the decaying countdown which accommodates for the wear on the wheel. However, there is a pretty significant delay here and it would be nice to speed the process up. It takes a long ass time to do 7-10 pairs of skates on the Sparx and it would be nice to speed this up.