Really?
The cover I have which is the genuine one from Alex is a pretty tight fit and ties underneath to make it even tighter... Also where I park is walled on 3 sides so very little wind, so bit if a sweeping statement really, depends on the situation...
There are plus and minus points for either, my car is a daily drive so I don't detail it to an inch of it's life anyway, certainly not this time of year anyway.
Also you should see the size of the cats round my way and the foxes too...