My TT doesn't have a spare, my Civic, my two A2s, my Mx5 (mk3) all didn't have a spare. None suffered a puncture and if they did, and the puncture stuff didn't work I'd use the breakdown cover that came with the car.
Its what its for, why ruin the enjoyment and increase the running costs of your car for something that very rarely happens when you already have a back up.
I've had about 3 breakdowns in the last 10 years, only 1 was caused by a puncture, but the puncture was repaired easily at Kwik Fit after the tyre was taken there by the AA. I didn't have to shell out for a new tyre, which is what you have to do if you run too far on RFs.
Incidentally, Alan went back to non RFs... maybe he thought 1 wasted afternoon in 5 years wasn't actually that bad.
If I get a puncture with the winters I'll use the gunk 1st and the AA second, or just tell Jackie to bring me a summer wheel as a spare if I'm near home
