That is to say, it made the transition to Kinesis Advantage a breeze.
I cannot speak for how its ergonomic might or might not translate into helping with RSI, but having constant back/neck/other joints pains since I was 15, one change that I introduced to my (variable height) desk last year was, at least for me, more dramatic than any other: I installed a keyboard drawer, which enable me to align my Mirra's arm rest with the keyboard (my desk and most other variable height desks do not go low enough to allow that).
The Advantage 360 could improve my setup as and I might get it just to be able to rest my arms at my shoulders natural width, which for me should be slightly wider than the regular Advantage.