So, you do not know if you like the RS1, but you're already thinking about getting the supposed to be (I've not heard the vintage) top of the line RS1? Doesn't they sell for over $1k, which is double that of a used "new" pair.
To the people who have heard and compared both vintage and newer RS1:
a. Are the differences so large that a person could like the vintage RS1, while at the same time not like the new RS1?
b. Or is the vintage RS1 still an RS1, while slightly better than new version.
If case a. is true, it does make sense to go for the vintage unheard, but if case b. is true, it might be better to just get a used pair new RS1 first to hear if they are at all likeable.
-----------------------------------------
I did have the MS2i, but sold them shortly after I got the RS1 (new buttonless). I really did like the MS2i, but the effortless and refined sound of the RS1 won. I do not find the RS1 to have that much more treble than what the MS2i did, I still find them (RS1) smooth like the MS2i. I might even say that the MS2i is more aggressive than RS1, and spoon-feeds you the sound, while RS1 plays it effortless.
I do think I like the more neutral soundsignature of the MS2i better than the RS1, but there is no question that the RS1 is in a higher tier. The soundstage is bigger, air between instruments is better and more deep bass (impression without real comparison).
I use bowls mostly. Flats seem to make them even smoother and more laid back.