While the attack did kill service for a good portion of the users for almost a day, there is an upside: We've now totally redone the configuration of our backend and setup new hardware/software to just ignore attacks like this in the future. We've also fixed a bunch of our load balancing bottlenecks which the attack highlighted.
As a result, the site is faster and more robust than ever.
We apologize for the downtime, though. We wish there was more we could've done to prevent this. We've extended the expiration date on all paid accounts by 4 days as way of saying sorry.