The problem here is that, IBU, while a great board (my preferred) has some QC issues.
They are easier to install and set up than clark, and are more compatible with the tamiya apple base etc.
while I prefer the IBU over everything else, i have now seen a number of failed boards right out of the box, sad to say.
Maybe Ivanho in Italy needs to involved. Any bad product right out of the box is at the least the responsability of the manufacturer to replace.
As I build the San Diego tank club i have reccomended the ibu due to my experince with it but also the clark and tmamiya, its all a cost basis really but its reallly just ibu and clark if you want to convert an airsoft tank. I got to say, as different as the clark is, ive never seen one fail yet.