Have a March 2018 build P100D and must have missed MCU2 by a few days. The mcu1 experience was horrible and would crash and was extremely slow and I got the MCU2 upgrade as soon as it was available last year. User experience has greatly improved, but I do wish it was still faster. In this age of 120hz screens on cell phones and minimal input lag it would be nice to have similar performance in the car. Youtube and the entertainment apps still take a while to load and there is a lag but it's a much better experience vs mcu1. I would recommend the upgrade, it would be amazing if they could offer mcu3 for older cars but that's extremely unlikely.