Just received this today and my first impression is that it is very solidly built and HSS works just as well as TTL. I received a second one in the mail with an X1TS transmitter and a TT600 which I will use off camera if I need a third flash. If you haven't already read the specs, it has an internal radio trigger and receiver, so it can be used as a master or as an off-camera slave while maintaining TTL and HSS. In TTL you can adjust exposure compensation 3 stops up and 3 stops down both on and off camera, and when shooting manually both on and off camera you can adjust the exposure of off-camera flashes. There's also a USB port for future upgrades, which I think was very smart of them. I use a99 and a77ii, both have worked great with this flash. I will update as I use it more often but for now I am very happy with this product.
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