It seems the Axiom light is only available for sale at that one website? Your design looks superb for quick release. What kind of mountings does the original light come with? The picture on their website doesn't show any, nor does it state.
FWIW, the light itself is very nice. The seatpost mount (basically identical between the Serfas and the Axiom) is the best seatpost mount I've ever seen. It's excellent.
Both of them have mounts for putting the light on a fabric strap, for instance on a backpack. Both of them completely suck rocks. A slight bump will cause either of them to just fly off and be lost. There's no retention at all.
On the Serfas it's a clip that snaps on. On the Axiom it's integrated but still horrible.
Yeah, the Axiom may only be available via Performance, it's probably a house brand. So for a few bucks, probably not worth it unless you're already ordering something. Back when I bought mine though, I had just lost my Serfas and they were still charging > $60 for that light.
I agree with the assessment though, anyone who has seen the Serfas/Axiom side by side with a Hotshot would not ever buy another Hotshot. They're basically the same price and the Serfas/Axiom is in all respects a better, brigher light with a better beam pattern.