Summarising from my posts in another (older) thread:
I tried a Kingston 64GB and had issues "please check the SD card" messages (spoken by the Blackvue) not long after I purchased it. The same SD card works fine in the Lukas dashcam I have in another vehicle.
I was tossing up between a Transcend or double-the-price Pitasoft 64GB card, and went for the Transcend, which has worked flawlessly for 4 months, with some recent days over 30 degrees (outside ambient temperature so far - it will get to over 40 in the coming months - and we know how hot the things get sitting in direct sunlight at the top of the windscreen!)
I wish it would take 128GB cards (has anyone tried, just to see if it would work?) I suspect it might be an issue due to the high number of files generated - but setting the clips to 3minute length instead of 1minute length would 1/3 the number of files in one folder (if the file number was an issue).