Guys, you've made a lot more money than me, so you don't need my advice. But if you want money back, you should probably be communicating in private through your lawyers. Posts like this look like you're trying to get (more) attention.
Maybe I'd feel differently if I were a Heroku customer, so I'll defer to people directly affected.
Besides, even if a lawsuit did get them their money back, after two or three years, it might not be enough to pay back the legal fees. Nobody wins most lawsuits...