The amp I'm reporting on is one you can own. Mark tested and found the old-style potentiometers lacking, but the Bournes 91's he now uses are silent and have a more useful taper. The Victoria is made of solid pine with finer-jointed corners, just like the originals. The cotton tweed. A big advantage of the hand-wiring, premium parts, and solid construction is increased durability.
Amplifiers break and mess up or delay shows all the time.
I haven't used this one long enough to say this with authority, but I'd bet that the built-in quality of this amplifier will keep it working at its best for a long time. Aside from that, I think that most players who use this amp will sound better, and it will inspire them to play better.