I installed on my VSU6 and it seems to work fine. I didn't do factory reset yet (maybe it won't be needed), just cleared cache & dalvik. Surprisingly entire GUI remains in Czech language as previous ROM, even when there is no option to celect Czech in language settings. Also none of turkish apps got installed, I suppose that would happen after factory reset... In addition, it seems that system partition is no longer locked like in 5.1.1, I can write to it using root and changes persist even after rebooting.
I can confirm bugs that are reported also for OTA update are still present (external speakers connected to headphone jack are usually not detected, option to format card as adopted storage is missing).
bok27: What do you mean with lang.xml? If I delete it, I will be able to select Czech language in phone settings, instead of having just English, Turkish etc.?