I've bought several items, and received wrong tamper size.
Upon contacting support they've sent me correct size within 2 days and told me that that there is no need to return wrong one.
Support is 5/5.
Shipping was fast to europe:
5/5.
Machining quality and materials are amazing, everything is well done, very shiny, polished, paint is great, feel of items is amazing.
However design needs improvements.
So shaker is barely usable unfortunately. Groove in lid collects coffee. Because body isn't monolithic groove between top part and bottom also collects coffee. Also tolerance between the middle piece and bottom ring isn't ideal and if grind fine enough (which I do because I bought high-flow basket) coffee goes flying everywhere.
Last flaw is that on 51mm portafilters ears are flush with top, and you can't really put shaker on portafilter and magnets do nothing, because they are recessed and don't reach anything as lip gets in the way of ears.
Unfortunately can't recommend this exact product and hope that next iteration will be better.