I’m quite happy with Marimba One’s pricing of their mallets - the lowest peice mallets already sound great and after that the more you pay, the better the sound gets (in my opinion).
But also!!! I think Marimba One mallets sound best on their own instruments, and unfortunately, in my experience, non of their mallets sound really great on Adams instruments - whuch is the most common brand in Europe.
So if you have a Marimba One marimba, than I this these mallets are for you! But if you mainly have Adams and Studio 49 instruments in your area, maybe buy Adams mallets instead.