To me..
...the RS's don't *lose* any of the previous niceties, it only *adds* way better soundstaging and realism.
I mean, to me, between the 225s and the RS-1s, it was like their was an electronic "veil" lifted off of the front of the music. Much more natural and inviting, many more smiles on my face. I'd call it "effortless" sounding. Noticeably (spine-tinglingly) natural. When I hear, say, a cello solo, I really do believe it's in the room, whereas with the SR series phones, I had to suspend disbelief a bit.
- Matt