Well... I drove around with it for about 100 miles today. It's definitely more sensitive than my old one, but not so annoying as to be not use-able. Maybe we don't have enough newer cars with lane departure warning in my area, but it doesn't seem that bad.
The only annoying part for me won't be a problem in your car. That would be my 5 year old sitting in the back giving me a play-by-play of which way the arrows are pointing, what the number says on the display, and asking things like "what would happen if there were 4 police cars, one in front, one behind us, and one on either side???"
