Jambalaya,
I’ve got a 525 estate which we’ve had coming on 9 years. The first year we had it there was a light dusting of snow and I found that the back end of the car would very easily lose grip and slip so I bought a set of alloys from a breakers yard which I had winter tyres fitted to. Every November I take the summer wheels off and out the winter ones on, swapping them back over April-ish.
Its fair to say that winter tyres completely transform the cars handling (have had Dunlop winter sports and Pirelli sottozeros, preferring the latter) – we had 11″ last weekend and the BM had no issues at all. It can still lose grip and does on ice but you’d expect that in almost any car. For Alps type trips we also have a set of Michelin easy grip kevlar snow chains for the legal requirement (and also a set of snow socks which in my opinion are better but are not legally snow chains).
Our other car – an Alfa Mito has crosscllmates on all year and they work well too. Clearly can’t compare performance in a meaningful sense between a 1.4 petrol hatchback vs 3 litre estate but they feel OK.
HTH?