These Swiss Lite bearings work well but some may be fooled by their quality. These aren't nearly as good as the top of the line Swiss in both performance and quality. As far as performance and quality, these can be very closely compared to ABEC-9s. I'd recommend those over these for sure. If you want the real deal, go with real Swiss. They're worth it. I played D-I roller hockey and went through my set of Swiss Lite's rather quickly and I take great care of my equipment. Regularly cleaned and lubed my bearings. Had much better luck with both ABEC-9s and Mission Swiss.