Welcome. To me it would depend on how important it is to have the latest-greatest, and how much money I'm willing to throw at it. If I could afford it and think that I'd get the benefit of the exchange, then I'd probably do it. But, do so knowing that the sonic benefit might not be as noticeable as I might suspect.
There are noticeable improvements that I've heard others mention.
The only thing that Axiom has to offer for upgrade offers, is the ability to sell your speakers in their public auction. But, that's all. Monies gained though their auction becomes monies that can only be used by purchasing from them.