Sherod,
They worked great. It doesn't take much listening to them to understand what Tony Gee meant when he described them as having near perfect tonal balance. Compared to the s/g/o caps, the VSF is also faster and more richly textured. The sound through them is as clear as a bell. Obviously, I recommend them very highly for the SR17.5.
Are you considering Duelund for a project, and if so, what speakers?