Even if we take ADAS out of the equation many reviewers have reported superior quality recording on the Thinkware F7x0 compared to the Blackvue 650. (The Blackvue 650 also needs an additional module for parking mode to work and it still doesn't have a battery monitor built-in). Sooooo glad I waited for the F770!
Just upgraded mine to 64Gb with a samsung micro-sd card - works a treat

Apparantly it can take 128Gb cards too but Thinkware don't recommend them as they can become unreliable quickly for some reason.