I had a chance to Test & tune One of these 21"s at this past WinterNats.
Easy To Tune.
Seemed to be like a Normal Picco In the since of wanting a little rich On the Low end Needle.And Performance seemed to be at its best around the 220 deg. range.
Power was Very stout on the Bottom end & mid range , And yet still Had good legs on the top end. Seems to be a very Good Bang for your Buck.