Well, I've only had my ProVari for a week, and I've got to send it in to be repaired.
I cleaned the battery contact this morning with a cotton swab and isopropyl alcohol, and now it doesn't fire anymore. It gets power, it will go into the menus, but I keep getting the E8 error when I try to fire it. Swapped batteries, swapped caps, allowed plenty of time for any alcohol to evaporate. Still nothing. Guess I'll have to fall back on my spinner for a week or so. 