I have tried all the parking options at IAH. Fast Park & Relax is the easiest, friendliest, cleanest parking by far. Theynare the only parking I use at IAH!
The parking lot is great, and seems very safe. What I LOVE about the Fast Park, is they are always there to take me to the lot when I get off the plane. Unlike the other companies, there are always shuttles running constantly. I tell everyone about the Fast Park. The reward system is great too.