I know that I had worried about previous DT/Hügi issues last year when I purchased a set for my "1/2" mountain bike as part of an upgrade to disc brakes. Based on folklore, rumor and issues with previous DT hubs, Mike T. on the MTBreview.com message forums started a FAQ with regard to the Hügi hubs and it includes some answers in response to questions via direct correspondence with a Hügi representative. You can find that thread within Mike T's personal FAQ here (scroll down to the DT hubs section):
http://www.execulink.com/~dtierney/wmc/faq.htm
Whether or not that has any relation to the DT/Hügi tandem hubs, I do not know. However, since I live overseas and in the neighboring country of Swizterland, the hubs are quite well known and used over here. I spoke with my LBS with regard to a possible upgrade wheelset for my new tandem. One of the salesmen at the LBS is a tandem specialist and he highly recommends the DT/Hügi tandem hubs. Of course, the prices of obtaining them here are much more favorable than Chris King or Phil Wood hubs due to import fees, etc... . I may end up being a guinea pig for this forum, but I still have to think everything through.
BB