The first time I owned a car that came with runflats, I really noticed the difference from normal tyres, but I sort of got used to it. They didn't ride as nice, didn't corner as nice, and were horrible when you hit potholes, etc. As soon as the tyres wore out, I made the decision to change to normal tyres and carry tyre sealant and an air compressor. Best thing I ever did! You do whatever you think you think is right, but knowing what I know now, I would never go back to runflats by choice, and would probably swap away from them if a car came with them.