+1 for BOA! Have a pair of 32s with a single BOA system. Depending one how much lean you put into your boot when winding it up you can adjust how much pressure is put on each zone. I don't find that as much of a problem as some other people seem to but every foot is different and even having said that I'd still prefer dual BOAs if I had enough money.
As Milo303 said, breaking doesn't happen often. I haven't had mine break on me either but I took the system apart when I first got them just to get an idea of how to replace and it's pretty simple. And just carry the spare cable and the kexkey around with you when you ride just in case, they're real small and you won't notice it.