I wouldn't trust Bulkpaq, even if they are CMC (which isn't great to begin with) produced discs with MCC dye. If it were true Verbatims that would be a different story as they are definately very good discs.
As for the AZ2 discs, I wondered about their quality too when I first saw them on special. But they proved to be quite consistent and of surprisingly decent quality (not to mention cheap from FS) discs. IMO they're a good buy, provided you can actually find them in stock.