I'm using 64GB Sandisk Ultra cards, mostly because at the time I either couldn't find 64GB Blackvue branded cards or they were four times the cost. They're still significantly more expensive, but available in 128GB now too which is great. The only reason I've ever had to replace any is because I lost them while transferring them from the car to computer. Now always make sure I transport them in micro-to-regular-SDCard adapters.