We used them on the Celeb bots, and most failed but we're not sure why. We didn't have them in cases, so it could be just swarf etc getting on them. In testing they were fine on the T64's at 8s, I know the concussion guys ran on one at some point, but no idea is it was single or dual channel.

8mm would be pushing it on chain, you might get away with it, I've always ran 3/8 pitch on boschs, 1/2 is overkill for drive.