Although by the time you review it the next model will be out. So I guess it's kind of like trying to hit the sweet spot.
Props for the fancy rotating base thingy!
I think it's true for those interested in helmets more for the fashion aspect of it (these are the guys that buy different helmets of the same type for the graphics, i'm looking at you AGV Corsa/PistaGP collectors).
But for the most part, helmet models continue production for years and you still can continue buying the base model for it's practical aspects and the prices hardly change, nor are they objectively any worse than newer models except for style.