I had experience with corruption of my SD control (INF) file which was corrected with Version 1.5
I received my version 1.5 dirct from Technics USA (via Eddie Williams) so I know it was an official release.
Furthermore, I did a binary file compare with the Taiyo 1.5 and they were identical.
I don't know anything about 1.6 but have had no problems since installing 1.5