I've used these belts a few times now. They are a pretty good blue zirc belt, especially for the money. I'd say overall, they are on the better side of the middle of the road belts for quality and belt life. Better than any blue zirc belts I've tried so far. They don't grind as fast as the blaze or other ceramics for heavy stock removal and don't last as long.
Ive been using the 120 grit to clean up my blades after HT and they work great for that. I use the 60 and 80 grits for cleaning up profiles and rough shaping handles. They last pretty good on wood, it seems, without loading up too bad.