I always mount Michelins on my cars as I find them to be soft riding and reliable. That being said, I do not put more than 8K miles on my cars combined.
No tire, run flats or not, would likely survive a blow out like I experienced back in the day driving on a highway at speed. Kinda scary but I was able to pull over to the service lane without any damage to mine or another car.
I did get a nail in a run flat and the TPMS informed my low pressure and sure enough a puncture. With a regular tire, I would have had to reinflate the tire before rolling to the tire shop. Now, since I have regular tires (yes, snows, hope I am not being dominant), I carry a portable inflator that doubles as a battery charger.
One of my run flats also had a cut in the sidewall. The MB dealer said it was not repairable so needed to be replaced. I had gotten the rim/tire insurance so the new tire including install cost me $50.
I agree as a runabout, especially in an urban area, no need for run-flats or a spare tire. I have AAA, the TPMS, and my air compressor.
Did I mention that the car rides so much quieter and smoother once I replaced the run flats? BTW, mine are unused and I intend to return them when my lease runs out.
Jeff in NYC
MB '06 E500W; MB '81 380SL
Retired: MB '17 B250e; MB '14 Be