I've had WFCO converters in the last three RV's, and the last one lasted 9 years before I had a power surge take out the charging unit. The one before that lasted until we traded, which was about 5 years. Never overcharged the batteries and they were powered on all the time.
I can't say that PI isn't better, but I don't think WFCO is as bad as people think they are.
Saying that you hear of WFCO's failing every day and you never hear of PI's failing, doesn't say much if WFCO has 90% of the market share. (P.S. I don't know what market share WFCO has. That was just an illustration.)
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!