I've never really used flash much, but in a few months I will have a strong need for one, so I've been doing a lot of research lately. Before I take the plunge, I want to find a system than will grow with me from a single on camera speedlight, all the way up to multiple off camera flash groups with ttl and hhs support etc. From what I've seen so far Gordox seems to be the only manufacture producing wireless (non optical) flashes, that integrates well with MFT. It looks like all the other manufactures would require the purchase of 3rd party transmitters and receivers like pocket wizards. Is Gordox the only one or do other manufactures have a system that doesn't require external transmitters and receivers?