Answering this post here, not in the FQ thread, since the poster is asking for my opinion:
The Matias has a very nice build quality. It feels solid. Once i fiddled with the settings, i was happy with its performance. I love how easy it was to use with the Mac, how easy it is to charge, and how long it seems to last on a charge. (I’ve only charged it once, and I’ve been using it quite a lot.) And i adore the teeny tiny dongle.
I’m still not wild about its handedness. And it really wants to be held in a way that isn’t how i want to hold a mouse. I’m sure it’s meant to be more ergonomic, but i find it less comfortable to use for a long gaming session than a mouse that’s more simply shaped. But I’m getting better at holding it the way it wants to be held, which does make it more comfortable to use. (It wants you to just drape your hand over it, and move your arm, rather than really hold it in your hand. That’s taking some getting used to. Not that your can’t hold it, but it’s less comfortable to do that than a traditional mouse, and way easier to use it without gripping than for a traditional mouse. I’m not really sure how better to describe it.