I have a double BOA boot from 686/New Balance and I love it. I used them a week or two ago up at A-Basin and Keystone for the first time and never adjusted them again once I set them.
Now, a guy a rode with at Keystone had some cheap single BOAs and he was constantly re-adjusting them (and he said they occasionally would loosen without warning).
So...I assume the quality of the overall boot matters as well.
Additionally, I think BOAs really only work for those who like tight, stiff boots. I do. Others don't. I cannot imagine riding my new boots, for example, for anything but freeriding. They aren't flexible enough (by design) to do anything freestyle, really.