I don't find the ride too hard at all - even on 18" rims.
Had a nail too ... the TPMS let me know straight away there was a reduction in pressure so I was able to get the tyre repaired without incurring any further damage.
I too was a little nervous about runflats, but I don't have any problems with them at all now. The only thing I would suggest is to make sure your tyre dealer has your brand and size in stock, or can obtain them quickly, just in case you need a replacement.
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