I have an A2 arriving on Friday.
About 2wks ago I ordered & tried out a Magni 3 that didn't work as well for me as I'd wished it would . I should have been a bit more wary of the Low Gain setting not being as low as I would have liked. A 6dB setting is not a low gain setting for anyone using a full sized DAC (Metrum Acoustics Hex) & any of the ridiculously high efficiency (AQ NH &NO) headphones listening to wide dynamic contrast music (There are no Electric Instrument based popular music genres of music I'm really interested in listening to anymore),
The A2 looks to be a better match than even the Jotunheim(sp) for a lot of listeners using a full sized non PC based playback system. I really do prefer having an internal power supply inside of the equipment I use (along with the option of using the power cord of my choice , which I will connect to my Equi = Tech 1.5Q BPT line conditioner which sits in front of all components in my playback system).
The Magni 3 was fairly impressive in it's ability to just "Get out of the way". The A2 should leave even less of a fingerprint on the signal path (& just let the several $k of equipment it's inline with take care of the playback as well as it normally does) .