Man vs. Machine
Anybody else have any experience with the auto-tamper? The little I've heard has been ok, but I admit to being slightly resistant. The only thing I can think of that may be a true advantage is the possible reduction in "barista's elbow". This would only apply in a truly high volume setting, of course. As far as the original question is concerned, using a scale as a training method can be effective, but it is more important to teach each barista to compensate for their tamp by adjusting the espresso grind as necessary.