If you're headed to Pittsburgh International Airport (PIT), this is the place to park your car.
I was a bit skeptical at first, but checked out some of their online reviews and have since used them about 3-4 times. If you go to www.aboutairportparking.com, you can find the discounted rate. ($5.90/day for airport parking AND free shuttle? That's a great deal.)
I've never had any issues, even though they valet your car and hold onto your keys. They also have your car waiting for you by the time you're shuttled back. (I was a bit wary of this, too, since anyone could technically jump into your car while it's sitting there... but so far, so good...)