O you will slide beautifully with those B'Stones. 
The reason I am going for all weather tyres is, I had a terrible time last winter with B'Stones on my Type R. I could not even mount a gentle ramp in the car park. So embarrassing. Never again. I also had a terrible time driving on the Continent. They were all over the place and I felt such a fool. Got some strange looks!
All weather tyres are jack of all trades, mastrer on none.
They are not as good as a proper 'winter' tyre in the cold and not as good as a high performance 'summer' biased tyre in summer.
You cannot make a tyre with a compound and tread pattern optimised for 30+ degreec C dry days, and -10 degrees in snow.
It's not possible.
Do yourself a favour...if you NEED winter grip, get winter tyres.
Run winter tyres in the cold, and summer tyres when it's not. It's a far better solution than living with a tyre that's not very good at anything.