Does High speed sync (HSS) work?
This allows for some light creativity when shooting different subjects.
Does the 3-group and ratio control settings work?
Yes. But I do set about -1.0 EV of flash compensation as I find Sony TTL to be a fair bit bright for my liking. Less or more compensation may be needed depending on individual taste.
What I like about the Phottix Odin?
1) Reliable triggering
2) TTL and ratio control for Sony flash (I particularly like the ratio control)
3) On-transmitter adjustment of light output of different groups
What could be improved?
1) Ratio control for 3 groups of flash would be a great feature to have
2) Price – not the cheapest (one transmitter and 1 receiver set will set you back about £350 in UK)
3) There do not seem to be any firmware updates for Sony Phottix Odin on their website (unlike with Canon and Nikon versions)
The Phottix Odin does work with the Sony A7R and Sony A6000 (and should also work with other E-mount and A-mount cameras with a hotshoe), to allow for creative wireless off-camera lighting and currently is the only available TTL system for Sony with control of flash groups directly from the transmitter.
I am aware that there is a Quantum Co-Pilot wireless trigger for Sony going through beta testing currently. This will hopefully be released by the end of the year.
Bearing in mind the older Sony flash (HVL-F43AM and HVL-F58AM) are much cheaper than the latest models and available used on eBay, this may be the most economical way to get into wireless (and also the only system for TTL ratio) control of off-camera flash for Sony.