I like the rubber feet. Keeps the amps from sliding as I change the headphones and they do offer some vibration protection for what it’s worth. What vibration is there when you are listening to headphones???
By Gumby I mean the Gungnir, it’s a nickname. The Balanced is the way to go since the Bryston offers balanced in.
For the Asgard and Valhalla it is SE only and Gumby offers 2 SE outputs. Perfect. I have all 3 headphone amps hooked up, fired up and ready to jam.