In reply to andic:
To add to most of the voices on here already, I have a few Metolius cams (mastercam + TCU) and after a fair bit of use over the last two years haven't had any trigger wire/kevlar break. The wires on one of my TCUs are a bit bent, but it still works (I think I've fallen on it in its current state).
They do seize up a bit more than my camalots, but nothing horrendous. Just be aware that they may require a bit more maintenance. They soon loosen with a bit of warm water + WD40, then some bike chain lube gets the operation very smooth again. (I'm quite careful to wipe off excess oil from the lobes!)