I had an extended and very interesting conversation with Alberto at AGD a few weeks ago. The guy is extremely knowledgable, yet so humble it's unbelievable. His approach of doing in-house R&D and module design and production is commendable. Also, as some of you mentioned, the upgradeability of his designs makes a huge difference given the rapid pace of innovation in this particular area.
I decided to go a different route for now, but AGD Audion remains very high on my bucket list. Maybe next year.