My latest flash is the Godox TT585S (also sold under the Neewer brand)
I was hoping Yongnuo was going to come out with their own version of a Sony HSS / TTL Flash since I already had 4 of their manual flashes and several radio triggers for them but as of January 2017 I'm still waiting. However Godox did produce a flash that supports High Speed Sync and TTL and so far been very pleased.
Sony Mirrorless cameras maximum sync speed is only 1/160 with their inbuilt or manual flashes - This is fairly slow. With my Yongnuo flashes I could take photos at upto 1/200 and not see the black band but once you hit 1/250 you could see the banding.
The Godox TT585S have High Speed Sync which means they will go all the way up to the A6000's 1/4000 Maximum which means you can use it to help capture fast movement (such as a group of people) or use it outdoors in daylight. This becomes very useful for filling in the shadows caused by the sun.
I now shoot with a Sony A6000 as my main camera and found the results to be very good indeed.
High Speed Sync allows you to take photos both Night & Day if you've never owned a High Speed Sync Flash for your Sony Mirrorless Camera then I can highly recommend the Godox for it's price.