I bought a black edition Fuji X100. The camera's low light performance is stellar- I can make virtually grainless/noiseless 8x12 inch prints at ISO 2000. However, there are times in very low light when I'd like a little help in the form of a small flash I can bounce off low ceilings. So, I purchased the Fuji EF-20 Flash. On the negative side, the flash is quite plasticy, in contrast to the solid build and feel of the Fuji "X" cameras. For its output, the EF-20 is also overpriced at $130 U.S. (a bit more costly than the more solid Nikon SB-400.) A plus is that the flash is plasticy, so it is really light. When standing up on the flash shoe to bounce, the flash doesn't overbalance the camera. The EF-20's TTL output is accurate, more so than the slightly lower priced Nikon SB-400 I also own. It is nice that the EF-20 is in scale with the size of the X100, and would even be in scale with the size of the X10. I like that the EF-20 runs on two AA batteries- I'm using two eneloops. The battery compartment door can be a little fussy, but it is no big deal. All in all, I'd recommend the EF-20. I'd also note that if you use the Fuji hood on the X100 and want to use a flash, the hood blocks the built-in flash. So, you'll have to buy a Fuji flash if you want a TTL flash.