I've used DR Sunbeams and Hi Beams on my Quantums, no problem. Hi Beams, Lo Riders, and Fat Beams on my Genesis, no problem.
Personally, with DR, I've always felt there was a bit of imbalance between the B string and the rest of the set, regardless of Hi Beam, Sunbeam, etc. Always found the B string a bit darker. This is a lot better if you get a 4 string set and get a bigger B string than they include in their 5 string sets. Most recently I'd go with one of their light 4 string sets with a .135 B. Larger gauge strings tend to have more harmonics, so this brightens the B up enough to balance better.
I've currently got Fodera SS on all of them, their standard "heavy B" set which has a .130 B. Really like these strings. Superbly balanced tone all the way across the set. Best B string I've ever tried. They're round core like Hi Beams/Sunbeams, but they're a bit stiffer than Hi Beams. They are a little more expensive, but very worth it IMO.
Don't know about Elixir. I tried them once a long time ago when they first came out, and the coating became a shredded mess with maybe 8 hours playing time. I've heard they've fixed that with a much improved coating, though.