Upload & Sell: On
I sold my X Pro-1 last month. I had the same RRS base plate on it, full time, but I didn't use the handle/grip attachment thingy. I have big mitts. I normally shoot Canon DSLR (currently 1D-series and 6D). The X Pro-1 felt fine, to me. In fact, it felt a little large, for what it is. I sold it to pay for an X-E2, which is almost exactly the same size as my X100s. Just right for this kind of camera.
P.S. I have the RRS base for the X-E2, but I normally don't have it attached, as it's noticeably thicker front-to-back than the base of the camera.