A recent discussion about a member's free upgrade to the volumetric version of an espresso machine generated a bit of debate about the use of the programmed buttons on an espresso machine.
Since it was on a slightly different topic, I've split that discussion off and copied the responses below.
Please discuss, I'm curious how thoughts on the merits of the programmed buttons might have changed recently. They do seem to be one answer to the problem of hugely varying crema volumes effecting shot weight.
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