I just got one! Quality wise it look identical to my 2012 Nugget. The shape is similar also but the Axon is 5'6" and got a more narrow nose. The pads, fins are very good quality. Here is a picture of the Axon over my Nugget, you only see the tail of the Nugget that is slightly larger :
As you can see the double concave is also as pronounced as on the Nugget. I might be able to try and compare it to the Nugget this Sunday.