I've had it done. MCU1+FSD Computer+Tegra emmc replacement.
Read my comments around... but basically in a nutshell:
- Much better than when the eMMC was failing
- Does not crash, freeze, or stutter
- Not nearly as good as MCU2
So, MCU2 > MCU1 w/replaced eMMC > MCU1 with failing eMMC
If I didn't have 82,000 miles on my car and a degraded battery, I would probably have ponied up for the MCU2 upgrade (which actually came out just after I sent in my eMMC for replacement). I don't plan to keep my car that much longer (although my opinion changes daily), so I couldn't justify the $2500 on a car that I wouldn't see a return on the investment.
You get what you pay for. I've posted a few videos of it in action on here... let me know if you cannot find them.
Now if they come out with iHeartRadio on the MCU2 only, there is a small chance I'd upgrade anyway. I don't know...