Think price is due to form factor. Just like the gm501 (zeph) you pay more for having a thinner / lighter unit.
When I got the asus the aero was the other contender. I travel a lot so was willing to spend an extra couple of hundred on a thin 15".
When I got the asus the aero was the other contender. I travel a lot so was willing to spend an extra couple of hundred on a thin 15".

