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Never seen it in a car or helicopter but I can say that it IS a must have based on my experience borrowing a 70-200 2.8L IS v1 for a weekend. I have a 180mm 2.8 prime and there is no comparison. You need IS on lenses that long. The good news is that you don't really need lenses that long on aps-c. After borrowing for a weekend, I found it only useful outside. Inside it is not flexible even in a big room because it is so long.