Been 100% reliable for me. Same for my XL and AX8. I've played hundreds of gigs with Fractal gear and never had a problem.
I’ll be the voice of reason. Everything can fail. I’ve been a fractal user since 2008, ultra, II and now III. My three white screened at my first gig with it. Since then I bring a backup. Most of these big touring bands have redundant everything.
The same design philosophy went into the III. In general I overdesign things. I.e. if a capacitor is used to filter a 5V rail most designers will spec a 6.3V part. I'll spec a 10V part. For electrolytic caps I always spec long-life and high-temperature parts. We always use ENIG (electroless nickel immersion gold) circuit boards with FR-4 cores, no phenolic crap or HASL.The concern obviously isn't about previous fractal units which had amazing reliability. The concern is about the Axe-FX III specifically. I can tell you that my Ultra's and II's and IIXL+ were solidly reliable but that doesn't tell you if the III is reliable.
I certainly hope it is...
i just saw Def Leppard play an all Axe-Fx III show last week. i'd say yes.
curious why there's a thought that live can be problematic compared to not live? anything specific you're wondering about?