Yup, I sparked a chain today on my MS 460 after touching a rock. It was pretty sad looking when I bought the saw, but dang...no matter how hard I tried to sharpen it, no dice, it's done. On the bright side, the full chisel on my Jonsered absolutely kicked butt. I pulled about 1.5 cords of oak out of the woods behind my house using the ATV and polar trailer. There is more wood back there than I could burn in ten lifetimes, the only problem is that the land is heavily used by hunters. I stay out when there is a truck parked near the access trail, but something tells me some day, some way, sparks are gonna fly, no pun intended.