Great set of chainrings, makes shifting easier with the shift ramps. One my second set now and the first set lasted over a year of rough XC and some urban riding. Teeth wear slowly. Make sure you get some strong steel bolts because the ones they supply are like plastic.
I usually had to go to a separate vendor for these chain rings. When I first boght a set of Race Face Team aluminum rings, I didn't think they would last a week. Was I wrong! They've greatly outlasted the stock composite rings that came with my Trek 6000 from the factory.