I'm not so much a commercial mowing company as I mostly just mow the farm I live on, with the occasional side jobs. I mostly do large acreage with a John Deere 997 72" mower or a Massey Ferguson with a 6' Lands Pride bush hog. On the 997 we usually get 30-40 hours of service from the factory blades purchased from the local JD dealer. These blades are usually worn down and unservicable after 30 or so hours here in the sandy north Florida soil, especially with the dry spell we've had over the past year. My brother was sold a set of "European" blades last July by the same dealer and told to try them and see how we like them. I don't know what brand these blades are but they were not painted, as the usual factory blades are, in black. These blades are just bare metal silver, do not rust, and have held their shape (no rounding off at the tips) for over 100 hours without being sharpened. Has anyone else run across these blades? They are phenomenal!