Buying Winter tyres down South isn't so much as tempting fate, but more a talisman against icy conditions. Bought a set of Marathon Winters around this time last year, marvelled at their weight (almost a kilo each), and fitted them to the pub bike ('80s Saracen with BioPace!). One bedding-in ride later, bike returned to corner of the coach-house with 6 missing studs where it remained until Spring, when the normal tyres were restored.
Riding SFX is somewhere between Rice Krispies & frying bacon; breakfast-related for sure, and made me quite hungry by the end of the ride.
(I love the look & value of the On-One Fatties, but with not living by the beach & failing to get much use from £50's worth of studded tyres, I reckon it'd work out as £100 a ride over the likely snow commutes in the next 5 years!)