I run the Aggressive Snowtrackers on my 1200 Doos because of their ease of steering, no darting and no pushing. Have never had any drop in fuel mileage running them on the Yamaha's or the Doo Four-Strokes. They are the real deal. 4000 miles on the set I have on my 14 Doo now and no chips or excessive wear. Good for many more miles yet! Beat them to death this year around home due to plowed fields, downed trees across trails, rocks and plenty of road running, cant believe there not all mangled, chipped and wore out. Best thing you can put on a set of skis. Had a set of 8" Bergstroms on early in the season and carbide is gone and missing after two rides on them. Not to mention the Bergstroms dart and are a bear to turn on my Doo. Only Snowtrackers here on in for me, every other carbide setup out there junk in comparison to the Trackers IMO.