I have the "PRO TAC SC GOLD" and they work great, I used them for many years. I now use a pair of Walker electronics and my son wears the ProEars.
I'd prefer a different on-off knob, it's easy for it to get bumped in the range bag and be left on. If you rotate the cups, so one knob is in the cup of the other, and the remaining one is against the head band ... it's harder to get bumped.