I'm interested how each of you are defining "gearth." Do you associate girth with anything in specific, like frequency response, or tube compression?
I ask because I used to use tube gear years ago and loved the playing experience, but not the weight, and because I've never been able to emulate the responsiveness of a full-tube head; the feeling of push and pull between myself and the amplifier on the way to the speakers - under the best of circumstances, the sound was immersive, immediate, three dimensional, and as though, in addition to playing the bass, I was simultaneously playing with the dynamics of the amplifier as I modified my playing technique.
The enthusiasm I keep hearing in response to the new Mesa amps and cabs makes me think Mesa gear may finally scratch my itch.