I too was worried about run-flats but having my car for only a week now, can't make any judgements. However, you do not need to check the pressure any more frequently than normal ones - the BMW runflat guide states to check it at least twice monthly. With my old car with std tyres I'd check pressure every time I fill up, so no worries there. What you MUST do is reset the TPM on the computer everytime you adjust the pressure. I haven't had any warnings - and considering everyday at work I have to negotiate unpleasant speed breakers - I'm happy so far.
I must admit that I suspect the ride would be better on stds. My X1 doesn't exactly smother bumps like, say, my dad's 1997 5-series.
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