Found an independent test at YT about the Smartcarb, didn't even know it existed. Promises more fuel economy, more power and self-adaptation to altitude, plus "jetting" is easily done manually with a knob. It's quite expensive though! But it could be a really nice addition to a Mito, be it standard or with a big Polini or tuned. Comes in 25,28,36 and 40mm and apparently only on premix, as it is initially conceived for dirt bikes.