I did my first studded ride on wed morning i did the d.i.y. way with the aggressive screws and i gotta say they performed very good on a varying of surfaces, i had to go through just about it all glare ice to the frozen solid slush to crisp snow and the rutted tire tracked ice. Granted i only studded the front so i had a little slipping in back but even getting out of the ruts the back tire followed right on out. Plus when you on dry pavement the screws sound awesome hitting the road.