you were responding to a [MENTION=196014]shovelhd[/MENTION] comment on DA cassettes.... that hasn't been an issue since they released the 9001 version (which was years ago), in my experience.

i was scared based initial reports but the shimano cassettes have been totally fine. shimano seems to have properly addressed the issue.

i also have a recon cassette for hill-climb use. it's fine but needs more careful/deliberate shifting and does better with constant (threshold/vo2) power vs lots of surges/sprints/jumps.