Picked up a Gjallarhorn a few months back when the had B-stock, and I was able to snag another B-stock unit a little while later to run them as monoblocks. I have used with my RP 600m speakers and to power my SJY Audio Starry Night headphones (Moonlight inbound as well). They gave my Starry Night headphones the extra push they needed to really open up (10 ohm 87db/mW).
Whether in stereo or in monoblock configuration they have proven to be quite capable power amps. Has anyone else given them a try yet, or have been considering doing so? At their $300 price point they offer great performance for the money (in my opinion). Not a very detailed description of the amp, but I decided to start a thread since one didn’t already exist.