The 90 minute versus 4 hour difference is the whole ballgame right there. That's not a small improvement, that's a game changer for anyone running multiple units. I get why the older guys balked, stairs and tablets don't mix when you're used to a clipboard and a pencil. But you gotta think about the bigger picture, if you keep paper around for them, you're basically running two systems and that kills the whole point. Maybe offer them a hybrid week, let them use paper but they have to transfer everything to the app by end of day, that way they see how much extra time it really costs them. Eventually they'll either come around or they'll weed themselves out, because nobody wants to be the guy doing double the work.

Wait, you're telling me 30 seconds changed the whole flavor profile that much? Like, you went from bitter to berry in the time it takes to blink twice? That's wild. I've had shots cool down and mellow out before, but a full flavor shift like that usually takes a few minutes, not half a second. Maybe your machine was doing something weird with the first pour, or the cup was cold and shocked the coffee. I gotta try this tomorrow with my morning shot, just to see if I'm missing out on a whole different drink.