I had a pair of DC boas and didn't like them at all. It takes me about 30 seconds longer to lace up boots and I'd rather spend an extra minute in the lodge than have to retighten the boas after a few laps. I never had a wire break but they definately were starting to splinter when I finally got rid of them. I had two rachets completely blow out and one entirely strip, so when I rode I had to tighten it as far as possible then take an old leash and tighten it as much as possible around the top of the boot just to keep the boot on my leg.
Honestly I think the Boa system is marketed towards people who don't really ride more than 10 days a season. Most people who put a good amount of time in them end up with some sort of problem. Also, you can't tighten them as much as you can a regular laced boot. Personally I like riding soft boots but I lace them up pretty tight so that by the third or fourth lap they have the perfect amount of flex.
Edit: Also, for the record I'm not a big fan of any speedlacing system. I tried a pair of K2 speedlacing boots last year and hated them. They had an upper and lower lace so that you could tighten certain zones to your liking but I could never get them to my liking. It doesn't take that long to lace boots up, I don't need any gizmos to speed up the process.