Hello,
I've sponsered several Steadicam workshops in the U.S. Our policy, not necessarily Tiffen's, is that these are Steadicam workshops not Glidecam, Basson, MkV, or anyone else's workshops.
Think about the support, booking, shipping, and everything else any manufacturer provides for such an event. The workshops I've been involved with and the instructors I've worked with all agree that the idea of a workshop isn't for the sponsors, the manufacturers, or anyone else to get rich. The idea is to train operators. I think it's one of those what comes around goes around karma type things.
The skills you learn can be used with any rig. I know we've trained a bunch of Glidecam operators at our Steadicam workshops in the past, they used the Steadicam rigs we provided, or their own Steadicams, and after they went home they used their Glidecams. Never a complaint.