Handling and road feel with runflats is terrible. I know its not EXACTLY the same, but I had a mini cooper S with the runflats and when swapped for non-runflats, noticed a great difference. There was a big difference in price too!

My gf has a 56 plate mini and it came with non-runflats and a wee compressor and foam in case of a puncture. Maybe keep a tin of the foam in your car if you do change over, just in case.