I just bought a Transcend 128gb card (from HK so it'll take a few weeks before it arrives; incidentally purchased from the same seller I bought the 64GB card from - which is now about half the price when I originally bought it - and about 1/3 the price of the 128GB!). If it doesn't work in the Blackvue, I'll try it in the GoPro or use it in the Lukas (Lukas takes up to 256gb cards!). I wanted to try a card with the same 45MB/s transfer speed as the existing 64GB Transcend card after reading the Blackvue UK review http://blackvueshop.co.uk/forum/viewtopic.php?id=220 indicating faster cards had a tendency to have problems.