I bought the Aura HD about the same week it was released (in the UK) and it has had heavy use and is still going strong. Sure, the battery doesn't keep as long as it did, but still way longer than I ever get the need to actually charge it (it charges enough whenever I connect it to have Calibre to play with it).
If you compare side-by-side with H20, you see a difference (the carta is better then pearl), but when you read it just works.
Which is a bummer... I really wanted to upgrade to H20 when it become available.