Nikasil is awesome. My YZ came frome the factory with it. Never had it bored. Maybe had 3 passes of a ball hone thru it in 2 solid years of hard riding/motocross racing. The second piston I put in it was a vertex black moly coated high compression piston. I replaced the rings in it once about a year later and the cylinder still looked brand new.
I'd like like to have my LT cylinder nikasil coated when I reach my max bore size. I'd also like to figure out how to coat a weisco with whatever vertex puts on their pistons.