It's not. Hawker posted 2 days ago that HB is ready, but that the geolocation stuff from the Demonbuddy ruling has caused issues with authentication servers for HB users as well and that should be fixed by friday. Of course it's hard to miss the important posts when threads get filled by yours and Botanist's QQ and negativism.
I try to use DungeonBuddy for my 66 ele Shaman with ShamWoWcc but everytime when a fight starts, ive get a big lag and then disconnected..