I too am interested in the compatibility issues with this new hot shoe. I would like to use a portable outdoor flash unit with my A7 and over here the Jinbei HD-600V seems to be a cracking unit in terms of bang for buck (the US equivalent is Adorama's Rovelight HD-600, which appears to be based on the Chinese unit). However, in each case, the supplied trigger is incompatible with HSS. Now some say that the Pixelking for Sony will do the trick but there does not seem to be any conclusive answer to this and I am unsure whether it's a hotshot problem. Can anyone here shed any light? (Pun unintended).