I have had no issues with the 700x35 Marathon winters. They were easy to switch on and off. I would do this regularly since the Vancouver weather wasn't always requiring them. They were fitted onto Mavic A719 rims (I think) and they were great and felt secure on the icy roads.

They mounted easily if that is what you mean by tight and loose. They weren't a beast to put on and the bead seated without issue. So I would say they were neither tight or loose.