I've been making the transition from DSLR to Fujifilm. The last thing has been replacing my old flash, mainly because I don't use flash a lot. I bought a Nissin i40 yesterday and used it today. I'm happily satisfied with it, great piece of equipment. I shoot off camera through an umbrella and the flash performed just great. When I saw it at the camera store, I will say I was shocked how small it was. Yet, checking the specs comparing it to my SB600, there wasn't much difference in performance despite the dramatic down-sizing. The comparable GNs: 30 for the SB600 and 27 for the Nissin i40. And of course the smaller size is a natural fit for the smaller mirrorless camera. One thing that did worry me at first was the placement on the slave sensor -- it's on the front panel. But the flash never failed to fire even once today, detecting the commander flash from my X-E1 wherever I was. I'm as enthusiastic about this flash as I am about my Fuji equipment. Highly recommended if you're looking for a flash for you Fuji and can't wait for Fujifilm to come up with a new flash.