Squirrel,
Agreed. I use mine for the SRT6 that is outside. I havent had any separation issues though. You do need to use the tie down loops when the wind gets heavy. I have had the cover lift off the front and back in heavy wind when not strapped underneath. The mirror pockets do keep it on the car though.

I would like to find one that is water proof though and then use my current one on the garaged car.