I find the RS1 to be like the "light" version of the AD2000, as if it went and got a full treble-tilt treatment.
I still prefer the AD2000 by a long-shot (whenever I listen with it it's just so amazing!) but the RS1 definitely crushes it when it comes to putting a positive spin on groovetastic-ness and sizzle & spark. I think "electric" describes the RS1 at its best - on high-octane, hard-driving music, it's spookily alive!
I'd take that statement one step further. Where you've said that the "RS1 definitely crushes it when it comes to putting a positive spin..." that's where the RS-1 just crushes (destroys) the musical enjoyment for me! The hopped up RS-1 treble is terribly over exaggerated and makes me want to yank them off me head in about 30 seconds. Sensitive ears, what can I say?
That's the biggest negative factor of the RS-1 for me, whereas you're describing it as the biggest positive factor of the RS-1. I think I would probably agree if only my ears could take all of that upper end energy, but sadly they cannot. This is not to condemn the RS-1 outright, as I can see why people would love this about them. I'm just saddened by the fact that I can't.
But on the other hand I have no problem at all with the upper register energy of the Qualia 010, so I have that base covered. Guess I'll never be an RS-1 owner and that's Ok.