capnsandwich, if Elixirs slow you down, then I'm not sure what to say. As elixirs are usually regarded as probably the slickest feeling strings you can get. They actually toned down the slickness a couple of years ago, because a lot of people didn't like it. They are still pretty slick!
Dragon Skins: I gotta say, I can definitely see, feel, and hear the coating. Is it bad, though? Well, the coating does feel kind of weird. It does seem to add a little bit of roughness, although I wouldn't call it grabby. The tone does something to the high mid. Its like you lose high mid harmonics and only get fundamental, in that frequency range. I'm probably confusing people by saying that, but Dragon skins have a peculiar "dry" quality, in the high mid. Its not bad, its just something which is completely their own.
they have better low end than other DRs roundwounds, which is a good thing. Because I find DR roundwounds to be a bit anemic.
I wouldn't say they last much longer than uncoated strings. And actually, when they die, Dragon Skins just sound like rubber. Sound like, coating. Whereas some (but not all ) strings, have a useable "dead" tone. Superbrights are my current favorite for totally useable "dead" tone.