MCW
Somebody's talking crap here & it ain't the tree!
I've tried the Pro Safety 5 points on my ported 390XP in our hardwoods and they were a waste of time. In thick bark I'm sure they have a place but they were that sharp that even in Pine they were pulling pieces of bark off and jamming in too tight in Eucalypt bark. More for looks in 90% of cases. I liked their extra reach though which came in handy on ugly shaped trunks but I found they actually lowered my efficiency when falling.