I drove my E90 in snow with all season on. They are not safe at all! I know my way around so I managed to survive a year before I decided to get winter tires.
Ever since I purchased my winter tires, I've been very happy in the snow. I just ordered a new set for my F30.
ALWAYS get winter tires. You need it specially when the temp falls below 7C...
*** / M Sport + Performance / Meisterschaft / Challenge / MORR / more to come!