Anytime you have cold air or suface come in contact with a warmer suface or air you are going to get condensation. Once the condensation is there it will freeze if the cold surface is cold enough. If the option was there when we got our Monty I would have got it. I know they do have problems with the seals breaking but all in all I think it would be worth having. We use to live in Michigan and did alot of winter camping. I remember them sweaty windows well.. do a search on line and see what they say between the two. Good Luck.
