So, RHA has been "sold out" for nearly a month. November 12th was the "new" release date on Amazon. I checked this morning and it showed in stock with an expected delivery date of 11/24 to 12/12 - 2 to 4 weeks for shipping! Prime delivery was not an option. Why - RHA - would it take 2 to 4 weeks to mail me these? And surprise, now at 10:09 am, they are sold out again. Seems like some poor supply chain management going on here. At this point, I'm not even going to bother.
As long as you're aware that for firmware updates you're going to have to "return" them to RHA, as they don't offer OTA updates.