Playtesting is underway. So far it seems to be going well, but we're only at level 1, so all it has is a breath weapon. I'll try to keep this thread updated with new information as it continues.
Thanks! Give me a link when you get yours up and I'll take a look. The Draconic Apotheosis ability (and all related features) is originally pulled from the Dragon Disciple PrC, rather than the Dragonfire Adept. It also changed a lot since the first version (which was almost verbatim pulled from 3.5) but I kept the name because I liked it.
As far as I can tell, my Elder Wyrm predates his. I'm not really concerned with it either way, though.
...actually, he's got a better list of example patrons than me. I might just steal that (kidding, of course).
Thanks for the feedback. The 1st-level feature, I'll admit, was originally a copy/paste of the Dragon Sorc's 1st-level feature. At the time the breath weapon was a feature of its own, but to give the class more utility I merged Dragon Patron and Breath Weapon and ported in the Magic Insight class feature from 3.5e.