A few thoughts on the Di700a Nissin flash with Air Commander. This is pretty much the only option for off camera TTL/HSS for Sony. Things to like 1) Good build quality in general - probably better than the Yongnuo 560iii 2) Very simple and intuitive interface. It is pretty similar to the i40. 3) Air commander has a pilot like which means you are not likely to leave it switched on accidentally 4) Removable battery pack will prove popular for some people 5) The Air Commander has a focus assist light Things not to like 1) Really it is too big to use comfortably on camera. Size wise it is almost exactly the same weight and size as a Yongnuo 560iii 2) The Sony hotshoe is plastic and flimsy 3) TTL only does =/-2 range (not enough for heavily backlit occasions). 4) No stofen included like with the i40 and a 560iii stofen doesnt fit 5) No top hotshoe on the trigger to mount a flash on top of the trigger on the camera. (There is a work around for the TTL range in that you can add additional FEV in camera.) Recycle is pretty slow from full power - about 15 seconds. However the capacitor works well. At 1/2 you can take another shot in 1/2 a second. At quarter power 3 shots consecutively etc.. Overall there is little to complain about. The biggest drawback is probably its size which doesnt make it great on-camera with the A7. Ideally I would like something somewhere between the i40 and the Di700a. Value wise it is obviously good value as the only real TTL/HSS off camera radio wireless flash available. Whether itis worth nearly double the cost of a Yongnuo 560iii + 560tx is dependent on whether you think HSS and TTL are valuable to you.