Rapid Micro is semi chisel and does stay sharp longer. All semi chisel will stay sharper longer than chisel. Also doesn't get as much damage if rocked. I use a lot of RMC, it's good stuff, but so it the Oregon equivalent.
I do know all about rocking a chisel tooth chain. I hit a baseball sized rock once inside the crotch of a Rock Maple. I can only assume that a kid a long time go put the rock there and that the tree grew around it. That rock wiped my chain out real good.