Mine just arrived.
I've used Seidio extended batteries in all my previous phones. They work great and no issues.
Me, too. I emailed their customer support when the batteries first came out and, at that time, they had no plans for it.
I'm hoping that it will still fit the Innocase I got for the Seidio cover. I'll report back when I get it set up.
Edited to add: Stuck in the new battery and put on the new cover. I'm liking this feel/size much better in my hand.
The holster that came with
this Innocase case/holster combo works just fine with the extended battery. It fits securely in the holster. Seidio also has a holster for an "uncased Hero" (that is, the bare Hero without a case). I don't know if that one fits.