Just got my first module yesterday, waiting for my case to come in... Fortunately I have enough semi-modular gear that can interact with it at the moment.
Cementimental, honestly, Arduino isn't so great soundwise. Teensy are ok but getting pricier and I believe that if you count the extra work and material you get to the price of Ladik modules (who definitely seem to do the trick.) I personally don't see the point in constantly trying to buy the cheapest modules unless they're utilities because often quality matters soundwise and I'd rather buy an average semi modular with neutral personality for much cheaper instead, if I'm more into functions than a particular sound. But that's only my opinion (Serge/Buchla fan, here...)
Monotome/anyone, who's selling a Maths? I'd love one with a black panel (I seriously hate Make Noise's designs but Maths has more functions and is easier to use than a DUSG clone for instance...)