I have had a clearbra on my car since about a couple of months after I bought it. After about 4-5 years, it started to show its age. It's taken a beating from car washes, tons of interstate driving, tons of 100+ temps, quite a few sub-freezing temps, etc. I also didn't baby it by waxing the vehicle or anything. It looks like crap now.

I'm still debating whether or not I'll get another one. I tend to hold onto my cars for 7-10 years, so by the time I'm done with it, the clear bra will probably look like crap.
Also, bug splatter can also dry on the film just like on the car's paint, so you better be cleaning ASAP. About the best thing it's good for is stopping paint chips.