I recently got the vari-flame kit, but haven't really used them enough to give a report.
I'm using them in a Traditions Pursuit Pro, and they seem to be fine with the small pistol primers I'm using. Good ignition every time so far (maybe 15 shots total), and no crud ring with T-7 (but it was light with regular 209s).
They are getting dirty after only a couple shots. Guess a primer pocket brush would be a good idea.
They are a bit hard to get the primer seated in, but I cheated and used a vise to push them in.