Boa is ok, but for me I could never get the boot to fit quite right. The system seemed to pull more on the upper parts of the lace and not the lower ones. This was addressed with double boa systems, one for the lower and one for the upper. I haven't tried on a pair yet but I get that solved the only problem I had with them.
Yes the BOA focus (double) is great. The jury is still out on DC boots, but I would say look elsewhere at this point. I had a pair of last years Allegiance that I bought late last season. With less than 20 days on them the outer stitching on the boot blew out. Now this could be a one off or a problem indicative of the line. I brought them back to the shop in early to mid May and they sent them back to DC. I still haven't heard a thing about what they are going to do.