I've raced a 2010 Axiom and a 2013 Axiom both in Super Heavies (400 lb +). The 2010 ran well. The 2013 was not good for me at that weight class. I gave the 2013 to a light weight driver (320 lbs), and it's really fast in that weight class. Just my experience, FWIW.
One of the best karts ever owned. Still have 2 2012 axioms. Have 2016 and 2017 xpect also new triton and recon and keep going back to my axiom and it's never failed me yet. Very user friendly and not tire sensitive.