Looks like the technical differences have been covered.
While they may not be the easiest to work on. If you buy one and send it to Jared for a good "once-over", you probably wont have to mess with it for a loooooong time, if ever. I can honestly say that my Viking is the only marker Ive owned that has never had even one hiccup. Flawless function every time. I cant say enough good things about his shop. He doesnt just send out "satisfactory" markers, they are exceptionally tuned.
You dont need a super-fancy Vike/Excal to take advantage of what AKA has to offer. Its all about the guts. One of the greatest things about them. The rest is purely cosmetic. I find it absurd that there are new spaceguns costing thousands of dollars that can be "Upgraded".
