James Hoffman on the YouTubes has a good channel about this where he sometimes does blind taste tests and can pretty reliably tell the good grinder / machine fr

James Hoffman on the YouTubes has a good channel about this where he sometimes does blind taste tests and can pretty reliably tell the good grinder / machine from the bad ones but he is a self-declared "weird coffee person" who basically spends his life brewing coffee etc. (e.g. founded a pretty respectable coffee roasting company in the UK.) https://www.youtube.com/channel/UCMb0O2CdPBNi-QqPk5T3gsQ https://www.youtube.com/channel/UCMb0O2CdPBNi-QqPk5T3gsQ