Upgrading to mcu makes you feel your car like new.
MCU2
Pros:
+ Responsive: fast map loading, smooth nagivation, changing playlist without lag, responsive menus.
+ Fast navigating: you don’t need to wait like 1-2 minutes for the car to draw the route for you. For long-distance route, my MCU1 took like 5 minutes to give me the direction. Now just few seconds.
+ Side camera views: you can view your side-repeater camera with mcu2, it is helpful when you park.
+ TeslaCam is more useful, able to record the rear camera, the recording is less choppy & smooth. Also you have the Live View function to watch your replay on your car.
+ More driving visuals, I believe it would help the FSD features in the future.
Cons:
+ The rear camera is darker, and useless at night.
+ Lost FM functionality. I heard Tesla will offer the retrofit later - but you never know.