I am happy to share my opinion but am not sure if it would be useful or helpful to most people because different people might place a different value for certain things. For me, daily, I only use the MCU for climate control, calendar, and FM radio. I don't even touch cruise control (let alone AP, games, web, and videos - although I did test them). In that regard, the MCU2 has 3 negatives and no positives over MCU1.
First is the lack of FM radio in MCU2. It turned out to be not as big of an issue as I had feared going in for the upgrade because TuneIn filled in fine. But still inferior to FM radio in that it is interrupted about 3 times on the drive from my house to work each day (due to wifi to LTE switching and spotty cell signals).
Second is the low sound quality compared to MCU1 even after adjustments (at least to my ears).
And third is the backup camera image rendering. It is usually dark by the time I get home and had to back into my driveway to reach the charge port (wife and son’s cars occupy the garage spots) and the backup camera is completely black on MCU2. I don't need a camera to back up a car, but got used to MCU images and felt that something was missing.
For occasional usage, MCU2 has several advantages over MCU1, which you would expect and gave been pointed out by others, including the speed at which it calculates navigation routes and renders maps, LTE signals appeared to be stronger, and live traffic seemed more current. I am happy with both the MCU2 upgrade and the daughterboard swap, but in terms if the value for the money I would say the daughterboard swap is a better deal ($320), at least for me. But for people who like to use autopilot, I imagine that an MCU2 upgrade is probably the way to go. Cheers!