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Think cost all in for me was around £700, £350 for each or thereabouts. No idea on the relative maintenance of the Baratza vs the Niche. I imagine the Robot is no more than a few gaskets. Only thing on top of that that I can think of for the Europiccola is the occasional descaling.
Can't really argue with the second point, though hand-grinding for espresso is not something that I'd want to do long term (I only have experience with the Porlex & Rhino, I imagine something like the Rok grinder would be a bit more usable, but also takes up a fair bit of kitchen space. Though I imagine you're pretty happy with the Helor also so I imagine that's also an option)
My Baratza Sette + Europiccola would like a word ;)