I think it has to do with there existing a few posts lately about new DBA-02's failing out of the box, or soon thereafter. Mix that with utterly horrible customer service resulting in a dubious warranty, and I think the resulting impressions are rather obvious. The B2 is made in the same factory, apparently, with the same molds, and presumably the same process, so that reputation gets somewhat inherited by MP4NATION, right or wrong.
If I were in the US (Amazon fulfillment) or nearer to MP4NATION, I wouldn't really see much financial risk in buying the B2, given that MP4NATION seems to be willing to stand behind their product (as opposed to Fischer Audio, who seemed happy to leave those screwed by the NA distributor ... screwed).