Like John said, these are so new there are no reviews. If I had to buy now, I would buy the Axioms because I'd at least have testimonials to base my decision on. But I am not you so here are some other factors to consider
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123s use treated paper for the cones. Treated paper is certainly better than just paper but it still distorts easier than aluminum during dynamic passages. Some may say that treated paper has better transient response than aluminum because it's lighter. First, it's not lighter because the treatment that is impregnated into the paper has mass to it. Second, transient response is not purely a function of the cone material but also the voice coil and the properties of the magnetic circuit.
I can't tell what surround material AV123 uses but make sure it's not foam. Axiom uses a rubber compound that will easily last 30 years. Foam would last 10 if you don't drive it too hard and if your environment is humid, expect them to last even less.
I haven't seen any specifications for 123's power handling. M3s can take 175W; M22s and 100s can take 200W. This is only a consideration if you want to play them "loud".
The frequency response curves on 123's site only extend to 200Hz.
I find it very strange that AV123's 6.5" woofer is crossed over with a 1" tweeter at 1750Hz. I hope the cross-over isn't audible. Of course you can't cross over too high because that affects imaging but 2500Hz may have been more appropriate. Axiom crosses their speakers over at more "conventional" frequencies.
Judging by the impedance curves, expect the x-sls to sound more laid back in the midrange than the M22s. To me, more laid back means less accurate.
Axiom products come with a high quality vinyl finish whereas the 123s come with a real wood veneer. You cannot tell however that the Axioms are not real wood even upon close inspection. Out of the dozens that have auditioned my system, not one has suspected that the speakers are finished in vinyl. A few have even commented that they loved the wood finish
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If you buy Axioms and need to upgrade later, Axiom now offers a trade-in program right here on this site.
Buying through Axiom is very easy and you will get great support.
Finally, Axiom has this great bulletin board and you can hang out here and have fun with us
. Actually, even if you buy 123, you can still come here and hang out (and maybe even share BBQ secrets). Let us know which way you end up going and what you think of your purchase. Good luck!