I received my 75D two weeks ago. The upgrade from the 70D was a total waste. They tell you to limit the charge to 90% for the "health of the battery" which is basically the equivalent of charging the 70D to 100% I can't believe they haven't increased the performance of the 75D, it should absolutely be marginally faster than the 60D or 70D. I feel like I was totally ripped off but very happy with the car other than this. I think everyone with a 75D would feel better about paying for the upgrade if it also came with a slight increase to the 0 to 60.... Something just below 5 seconds which we know is possible if the 85D could do 4.4 seconds with same motors.