Just came across some info that I thought was worth passing on. It's known that the rear camera is the same in both these models, but it's also been discovered that the 750 and 770 are hardware identical, with the only difference being external cosmetics. This means that it's possible to upgrade a 750 to a 770 by means of a firmware upgrade and from then on it will act like a 770 in terms of software updates. For people like me who bought the 750 (I have one in the car when it came out and then bought another for the van because the extra features of the 770 weren't worth the extra cost to me) it means a free upgrade path, the only caveat being that you mustn't have upgraded the firmware on your 750. Anyway if you're interested all the details are here Thinkware 750 Development