GS1000i is much more open and spacious than the RS1s I have (I have not heard the RS1i).
RS1s have nice tonality but can be sibilant and present a flat stage and be a little closed in.
I hate to use the term, but in this case the GS is in another league.
The PS1000s have even more rounded mids than the GS, but the PSs have too many other faults and I feel they are a work in progress.
The GS phones are definitely a dynamic phone, as opposed to the Hifimen and Audezes (and Stax for that matter), which all have a detectable planar character.
Dynamics seem to highlight images showing their definitive edges, whereas planars do not emphasize edges, and are smooth, sometimes smooth to a fault
when contrasted with dynamics.
For instance, Senn HD800s and Grados especially (along with Fostexes and Denons and AT phones, and even R10s to my recollection, but to a lesser degree), clearly show each
image standing out from the background with the boundary around it, even with a touch of grain sometimes (and that grain can actually be satisfying).
Planars seem to suppress that. Even Stax 009s.
So planars and dynamics are sort of like Venus and Mars, and vive la difference, and never the twain shall meet, or whatever your metaphor of choice is.
Edited by rgs9200m - 12/20/12 at 5:17pm