Received it today and my first impression is that it is very solidly built and HSS as well as TTL works fine. 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 read the specs yet, it has a built-in 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 up to 3 stops and down 3 stops, both with and without a camera. If you shoot manually both with and without a camera, you can adjust the flash exposure. that are outside the chamber. 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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