I've had experience with Runflats since 2004, with an AWD Toyota Sienna. We've had one blowout but I was able to drive to the nearest Walmart (5 S heading towards Disneyland/Anaheim). While blowouts can happen their reinforced sidewalls have never separated from the rim for me nor my wife, meaning they got us to a safer spot to be able to check on them.
Probable negatives, increased unsprung weight, possibly driving like a truck, and possible loss of MPG/EV miles, cost. Wife did not notice the light driving back from Vegas with her mom and sister. When she got near Walnut her sister noticed a horrible noise as she was driving to pick her up near the store door. By the time I went to inspect there were steel threads sticking out the sidewall like hair on a very bald head!
But she didn't get stuck on the side of the road...
I accumulated A LOT of curb rash. So much I am worried about it damaging the new tire bead. To counter the extra weight instead of having Wheels America repair them I am looking for some Konig Maxxim Winner wheels. Hopefully wife doesn't give me a hard time with the cost....