I bought MCU2 for my pre-AP 2013 MS a few years ago when the price was still 2500€. My MCU1 emmc died and there was no recall yet, so I would have had to pay the fix myself.
We were really happy with it, even bought small game controllers so kids could play the games. Netflix is great. And Caraoke too. Surely you can use your phone for most of the same things, but it's much more social for everyone to stare at same screen and interact with each other!
Last April I bought a 2016 MX... It had MCU1 with emmc fix just done. Initially I was reasonably happy, I thought I wouldn't bother with MCU2. It was fast and snappy, much better than the MCU1 in my old MS which probably already was suffering from emmc problems when I got the car .. I tried to convince myself that I don't really need the MCU2 goodies. But it was kind of a step backwards from the previous car
Then navigation informed me that new maps are available, but the download always stopped halfway through. Later route planning started lagging... I learned from this forum that there is another emmc for navigation, which can suffer exactly the same problems as the main emmc! And there is no recall for this part, so again you pay the fix yourself.
Some cars have replaceable microsd card for navigation, but no such luck in my case. Empty microsd slot, it is using internal emmc.
What a piece of crap hardware! Also there is another emmc inside the IC. Again pay for the fix when that goes out.
Anyway, the car was anyway going to service center for tow hitch installation. I added MCU2 to the order. Haven't regretted it.