then even within 3.0 there are minor variations I believe. The later units have the gobs of goo on the motor wires on the esc's and more gps shielding (I think). Mine has all that and I have seen pictures of other v3's that don't have the gobs of goo on the motor wires. I don't know if there is a numerical distinction (I don't think there is). I think it was more like on the fly production tweaks responding to customer issues.