I'm pretty sure that most people who have used any of Google's pay for services knows just how bad that support can be.
What happens if something goes wrong with your billing on EC2? No problem, you call them up and sort it out.
What happens if something goes wrong with your billing on any Google product? You'll be down for days while attempting to get Google to even acknowledge a problem.
Until Google fixes their support issues, anybody using a Google service for anything business critical needs to be very careful in weighing up pros and cons.