I'm looking closely at one now, and while lots of folks have weighed in over there years here on the pros and cons (mostly the former) on Eb Bessons in various forms, there's not alot of info on the older Willson 3+1 compensating Ebs.
I'm told they are similar to the Bessons of similar vintage but they are a little "weightier" and consequently gain a bit of core to the center of their sound.
Would anyone be able to enlighten me on this
Chesapeake Silver Cornet Brass Band
Aldersgate Brass
Besson 982
Mouthpieces-a-Plenty
They are not very similar to the Besson/Booseys. The same adjectives you'd use to describe the difference in their euphs would match the description of their Ebs. Playable, bigger and darker than a Besson, but not as rich as a Besson, and perhaps missing a few pounds of torque on the loud side...
J.c.S.
Instructor of Tuba & Euphonium, Cleveland State University
Principal Tuba, Firelands Symphony Orchestra
President, Variations in Brass http://www.jcsherman.net