i got a tyre fitter friend come out to change my wheels over.. and we were talking about winter tyres. In his opinion, he said its usually better to just deflate the tyre a little when it snows heavy. When there is ice you are fecked no matter what tyres you use... and it is usually ice that causes the bangs!
He has recently (well last year) ended up changing quite a few winter tyres due to damage.