OK, so I'm 63, have 5 stents in my heart, am diabetic, sarcoid & have back problems.
I have just replaced my UK redface MAG400 with a GB Shuttle 6, and, LET ME TELL YOU, I'm not complaining in the slightest.
I have a smallish cab with an Emminence 3015 in it which gives me plenty of lightweight power for small/medium gigs and a bigger 1x15 cab on big casters which I can add for bigger gigs - heavy, but easily moved.
The small cab/Shuttle combo means I can put the amp in my bass gig-bag over my shoulder & carry the cab in my hand.
SOOOOOOO much better for me than the other weighty gear.
Tone? Bags of it!! I never had a problem liking the tone from either the Ashdown or the GB. I get a lot of my tone from the bass pre-amp anyway.
Audience doesn't much care about what they hear anyway, providing they can either dance along, sing along or still be heard nattering over their pints.
May be parting with the MAG soon. We'll see.
G.