I have one. We're always hitting the button while it's in the garage. It goes up a bit and as soon as it hits something it goes back down.
I wouldn't worry about that as much as I would trying to get on top of the vehicle when it's been raining and everything is slippery. Believe me there's been some pretty stressful times I've had to get in there to get stuff.. toddler screaming for a toy and me stopped on the side of the interstate while it's been raining, everything slippery, cars flying by 100 Mike's an hour, etc.
You have to stand on either the rear bumper or one of the tires to see anything in there (or carry a step stool with you).
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