You'd be fine to drive on them in those conditions. My first ever drive in the VXR was in horrendous weather and this was back when I gave very little thought about the tyres, and they held up without a care in the world.
Wear will be horrendous, expect to see around 5-7k miles out of them depending on driving style. That's on the GG (medium) compound, which is the most common one.
I agree you could get those sort of miles out of these tyres if its a daily driver but do a couple of track days and you will be horrified by the wear rate!!
If you dont do too many miles,do the odd track day and are carefull when its lashing then the extra grip is well worth it.