Buzz,I've looked through their top two lines,the Midas and Cronus. I was pretty impressed with the optic quality of these scopes. USAOptics in Grand Prairie,Tx is a dealer for them,and have excellent prices on them.
The Midas scopes are on par with the Sightron SIII,Vortex Viper PST,and other $1k and under scopes.
The Cronus line is top notch,the glass is on par with scopes like the Razor HD,Swarovski,Nightforce,etc. Whether the internals are of the same quality is yet determined,but they are very nice optics for the price.
Both of these series of scopes are made in Japan,the rest of Athlon scopes are made in China. There are a bunch of guy's on Snipershide that have really good things to say about Athlon scopes,as well as the good customer service that they've had dealing with Athlon about their optics.
I'm planning on trying out a Midas 4.5-27x50,and if it impresses me,I'll probably buy a Cronus.