Hi all. I know X100 doesnt get much chatter here, but although no output photos from this combo yet, I know others have inquired as to how it looks. I have previously owned the X100 + EF-20 (larger flashgun, but same GN 20 as the new EF-X20). Anyway, I wanted a smaller flash than the EF-20, which although it can bounce, it is larger larger!. This one doesnt swivel, but has the addition of a built in diffuser (via switch). When I add a cheapo stofen/diffuser knock-off ($3), it works quite well esp in redirecting the light and pseudo-bouncing. If want to, you can compensate in 1/3 increments for Flash EV + or -. Samples forthcoming.
X100 + EF-X20
X100 + EF-X20 + cheapo stofen diffuser
Lastly, and in case anyonje is curious, the strap is from LanceCameraStraps.com: String Loop Adjustable | Lance Camera Straps