I'm going to paste my response from the Firmware 7 for Classic MS Thread, no sense re-typing it but I added a bit to it as well:
"Regen has been reduced in the firmware 7. I have a benchmark road I test it on.
Fully warmed pack, that is able to take the full regen power, if I remove foot immediately as I pass the 55mph speed limit sign while doing exactly 60, I will be doing 5mph as I approach the stop light. Thats how it was when I got my car (Firmware 4.2 and 4.5). as well as all the loaners I had back in 2013. NOW, however, in the same exact spot, where nothing else has changed, done exactly the same, I arrive at that stop light doing ~18mph in my Classic version car, and with EVERY autopilot loaner I've had, I've arrived at the light doing 25-30mph. My benchmark proves changes were made. I do not like it, I actually wanted STRONGER regen then what I had when I got my car. Not less."