Switched from twist-on B connectors to Wago 221s on a 16 zone panel in Denver last week
My hands were cramping up after 9 hours of splicing, so I grabbed the Wagos I had in the van, and my install time on that panel dropped from about 5 hours to 3 and a half with zero callbacks so far.
Wait you did 16 zones in 3 and a half hours? That's insane, I've spent longer than that on half a panel with my old method. Did you use the 221s on every single splice or just the grounds?