So I have a Baratza Virtuoso that I've been using for about 15 months or so. I can't really say how many pounds I've put through it (100?) but it gets used for all non-espresso grinding duties. Recently I've started bringing coffee to work, where we use a buddy's Virtuoso to grind primarily for AP use. His Virtuoso is newer and has very few hours on it (it was basically collecting dust before he brought it in). I've noticed that AP cups are brighter, sweeter, just plain better, at work. There are other variables in play here, namely a newer AP (man, the plunger rubber is stiff on the new one!) and different water (spring water in both cases, just different sources)... of the three variables, I was leaning towards worn burrs on my Virtuoso but what do you guys think? Irrespective, what is the expected lifetime of the Virtuoso burrs? They're dirt cheap ($28) so it's a no-brainer to replace them but still...