Bought IDEA during the Doomsday Sale, first time I tried was the 'big' downtime and failed, and then waited several hours and tried again. One of the best purchases I've done!

I also picked up IntelliJ this time around. Even though I mostly do .Net development, it's too good an offer to pass up. This gives me an excuse to translate some of my libraries to Java.

The 'end of the world' sale was pretty heavily discounted if I remember correctly. Maybe they actually believed it...