Hi everyone, My question may not be easy as the Nissin i40 flash is not yet available. ( http://www.lightingrumours.com/nissin-i40-speedlight-announced-in-japan-5375#.Uy7se4X3nYy ) The flash will be used with an Olympus E-M10. I can get a Olympus FL-600r flash for a relatively low price (200€ instead of 350€, the equivalent Panasonic flash being available at 260€). I don't know how long the promotion will last, so there is a temptation to take it now Based on the US price of the first Nissin models available for Nikon, I think its price would be around 250€. The Nissin flash is announced for june and that's not a problem for me to wait until then. (however, it may be the availabily in US only... sometimes in Europe you've got to wait a lot more) The Nissin flash is a little more powerful (not very important), a lot more compact, and has manual controls which are a lot more easy to handle, so on the paper that would be my first choice. I'm not sure the FL-600R will be comfortable to use with the E-M10 even with the grip on. Maybe I'm wrong?