Funny you should mention the DR's...I have been using Hi-Beams on my Series basses for awhile. I like them. Recently, I tried a set of DR Marcus Miller Fat-Beams, and I really love them. They are slightly less bright than the regular Hi-Beams, and a little warmer sounding, too. They really seem to match up weel with my Series electronics, which sure don't need help from a string to sound bright .
As compared to Rotosounds, Hi-Beams and Fat Beams last A LOT longer...they sound almost new for a month at least. I really like Alembic CX strings, but they just don't hold their good tone as long as the DR's.
YMMV, of course.