The Authorize.net downtime a few weeks ago was just as bad if not worse. They didn't even send an update+apology after things came back up. Terrible customer service.
Thank you for posting this. After today's incident I was 100% certain I was going to switch to Authorize.net. Why did both companies not send out notification emails!? Doesn't seem like too much to ask.
Auth.net did have a twitter account where they were keeping everyone posted on the progress.