Hello Mike,
If you like tube amplifiers then I am sure you will like Spectron. I am also tube lover and I have compared Musician III Signature with VTL Zeigfried and I liked Spectron more.
See - http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1180897750&read&keyw&zzspectron
I am aware that Wayne Donnelley, reviewer of The Enjoy The Music sold his VTL ( Siegfrieds or one level down) and keeps Spectron as well. And its all about older Signature model and stereo configuration. New Mk2 is much better, not to mention monoblocks
So if you need power, have a difficult load (Wilson speakers dip below 2 Ohms as far as I remember) and like tube amplification then Musician III Mk2 should be ideal, particularly if you can afford two units and run them in monoblock configuration
All The Best
Rafael