But what marketing advantages do you have when you number your new straightish-stable putting/driving putter like your popular meethook utility putter?
The Luna numbers 3/3/0/3 are similar to the P3 numbers, which in the beginning were 3/2/0/3. Later they corrected them to 3/2/0/2, which much better reflects the actual flight. From what I've seen, the Luna flight should be pretty close to a P3 flight. Even a new P3 is not close to a worn in Zone. Now one may say: different companies, different number meanings. But Zone and Luna are from the same company and their most important player has exactly those two putter molds in this bag. It makes no sense to me.
Interestingly, however, the Discraft stability ratings are much different and seem to be pretty good: Zone with 2.0 and Luna with 1.0. Maybe they should get the four numbers flight system explained again. ;-)