Update:
Thanks to you guys' info, I went for both lines, and have these last weeks taken reception of a Streamliner as well as a GBE instead of a Max.
The way I understood it, the best argument for the ShuttleMax over the GBE is weight, so I assume that the GBE is not a worse amp.
Even when shoved through Ashdown LB 112 cabs (made for the Little Bastard), the GBE was mighty, open and airy, and responded to every little change in my "playing". I guess this will get even better when shoving it through Vanderfaceds.
Not tried the Streamliner yet.
So: thanks again! Playing bass became more fun.