I live in Michigan and normally keep my 300C in the garage during the winter months so it has never been exposed to road salt. My garage is used as a gym in the summer and as a place to park my car in the winter. This year I decided to keep the gym open and keep it available throughout the winter. When we get warm clicks (over 40), which we often do, my heater can't keep the garage warm enough, so I bought this cover. I wasn't sure what to expect in this price range but was pleasantly surprised when I opened the package. The material feels very strong but is soft enough on the inside not to scratch the surface. I was able to install it myself in less than five minutes. It has only two fasteners that attach under the front and back of the car and are held very securely. I check it every now and then, especially after a windy day, but so far it hasn't loosened at all. We haven't had any serious snow yet, but I don't expect that to be a problem. I also don't plan on leaving snow on the cover to extend the lifespan a bit. But at this price I'll just buy a new one when this one wears out. If it had only lasted one season I would have been happy - not that I had low expectations. At the moment I can definitely recommend the case only for the quality of the material and the ease of installation. I will provide an update if anything goes wrong. Update 2/17/19: It's the middle of winter in Michigan and we've had some snow and quite a bit of freezing rain and sleet. At one point there was three inches of snow on the cover. Eventually it melted and the lid doesn't stick to any of the surfaces. Because it's only attached at the ends, it allows for good airflow. I do see the case buckling on windy days, which some people might not like, but I prefer something tied down so air can't get in. Still seems flexible and I don't see any cracks or breaks.
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