FWIW, I've always found Harken equipment to be quite dependable. But then, I'm typically using their stuff that has been tried-'n-tested for many years...micro blocks, bullet blocks, 2-1/4" mainsheet systems.

I did have an issue a few years ago though with one of their plastic cams as others have mentioned. The cam was used on one of the exit blocks for my downhaul. The downhaul line wore a groove into the cam and it wouldn't hold...had to just tie it off for the remainder of the race. So I plan to stick to the aluminum cams in the future.

sm