I reached out to customer service after placing my order because of a shipping label error on my end, and it was promptly resolved prior to the unit being shipped.
I also did a lot of research before committing to this purchase and I found the df64 gen 2.3 to be in my price range for going "big" into making espresso based drinks at home. The grinder arrived, burrs aligned really well (within 1mm of zero), and it operates much quieter than I expected it to grind, as it seems so loud in the videos that I watched. Very impressed with this grinder but the only previous coffee grinder experience that I have to compare it with, is a krupps gx5000 that I got for making cold brews and regular home brew coffee that obviously not on the same level of quality grounds for espresso. (It is about the same noise level. Just a different frequency)
I'm also pretty impressed with the df64 zero retention that again, I have nothing to compare it to, but the grounds all weigh out the same as they do in, from the first 50, 16 gram shots I've ground through it so far. Nothing bad to say about this grinder, at all and the customer service seems personable thank you thank you