Hi arrbee,
I use the actual FW and 40% of my HD-MKV's have the audio synch problem were the audio runs more and more out of synch over time in Kodi and HiMedia-Player.
For the rest 60% I have to set a constant delay in Kodi.
There are also still issues with some 3D-ISO's in Kodi (blocking artefacts, audio synch) and HiMedia-Player (blocking artefacts, audio synch and no forced subtitles).
Also 23.976 Hz is not supported, which leads to micro-stutter every 42 seconds.
There is no solution yet unless using an other player for this files.
We (the H8 customers) are waiting for fixes in the next FW.
I hope HiMedia will come with a new version shortly which will run much better to get a good reputation for the x-mas business.

Actually I am sad that I can not recommend the H8 to family, friends, colleagues and in forums.