While I had less than optimal PCAS reception with my powerflarm until recent firmware upgrades and antenna replacement, I had zero false alarms during the 300 hours I flew with it, not even once. I have a Becker mode C transponder.
My experience so far with both Powerflarm and Butterfly support was very positive. I found both Gerhard and Marc to be very responsive. Just need to know who to contact instead of sending emails to the official email address which may be clogged...

Ramy