My only experience with DR strings so far is with the Jonas Hellborg set. A player I trust recommended them for the Dingwall SJ-4. They really do make it sing SO sweetly.
Since that worked so well and I am basically curious, I tried them on my Ric 4003. Pretty cool tones. I think the next set I am going to try are some Sunbeams on a dual-humbucker bass. I'm not strictly a DR guy, but I like what I've heard (and felt) so far!