I ride an MB5 all winter and in the Detroit area. I don't ride to work or places I HAVE to go, I just ride for fun but I do ride all the time and out on the ice off of Grosse Ile. The MB5 does not have knobbies and is as close to a slick as they get. They work great in the snow. Not deep snow but snowmobile trails, the ice and dirt roads covered with packed down snow, it goes great. I have raced MX for 26 years and ride my dirtbikes in the winter but knobbies wont work unless they are studded. Knobbies put less rubber on the snow and unless you are in deep snow they don't work well from my experience. If you live near Detroit, I would be happy to ride with you anytime you want. I would also be happy to take you out on the ice if you really want to have some fun.
Bundle up with layers and ride away all you want. Full-face helmet with no-fog on the shield is a must. Just watch for pavement to snow/ice transitions and ride slower with caution. I ride with MX boots and gear when I go out on the ice as you will fall. If your ready, its almost fun as the snow breaks much of your fall. Keep in mind, I am old and you are young so falling for me isn't like you falling and getting right back up. I sometimes fall and have a smoke while I am laying there just to enjoy the snow and surroundings.
One thing that is important is to re-jet for the cold air. We all need to re-jet now anyway as the quality of gas has really gone to shiite. The amount of alcohol in the pump gas right now is so bad that one size main jet is going to need to be done even in warm weather if you don't want to hole a piston or seize. That is another topic but going up a size or two on the main in the cold is a must. The cold air will lean out things in cold weather. If you don't do anything else, at least re-jet for the cold.
Eric in Mi.