I’ve never used run flats on my mazda, but only because I’ve had them before on a previous vehicle and I wasn’t a fan. They’re much firmer in the sidewalls and I found it makes for a way rougher ride. Also, if you are in colder climates, when the car sits overnight in freezing temperatures the tires freeze in the shape they’re in while parked. The flat areas contacting the ground take awhile to take normal shape once you start driving so for the first few minutes it feels like you’re driving on a wash-board “thump thump thump thump” I thought something was seriously wrong with the car the first time I experienced it.