The new tweeters cost $78 each. If you are running your system with a receiver then I would say there is no need to be replacing the tweeters with the new ones. If you have big power and like to play it loud or have a large space to fill then the benefits of the new tweeter could be something to consider.
Actually my question or should I say my expectation would be to guess this new tweeter should sound better if I can’t dare to say? Maybe Axiom will stick at this very moment mostly to the original sound but will develop/improve the sound in a near future (v4?)
I have always found the tweeter from Axiom to be the less good component of their speakers (And when I say less good does not mean bad at all) But these new development about those tweeters sound refreshing and I hope Axiom team will take the most of it that just claim it can handle louder sound like Ian says.
The only thing I can tell is that I’ve heard a substantial improvement on the V3 over the V2 (M3 model)