The Voyager X2 is an incredible knife. After a 4-inch blade, the extra inches on the blade increase the knife size substantually. Because of a rib injury, I can't conveniently carry the large Voyagers around the waist, but carry them in my pocket.
My favorite blade size is 5 inches, and I like the Gunsite I model the best. I wish the 6-inch Voyager came w/a partially serrated blade, as it offers enough edge space to use each effectively.
By holding it in the middle of the grip, you have even more extention, which is nice. You can even hand the thing to your biggest, badest friends and ask them to break it in half and they won't be able to. It is one strong knife. An all black model would be even better, but the polished silver blade is attractive and resiliant. As far as I know, no other knife maker makes a folder that size.
As far as VG-1 goes, it's whatever steel Lynn Thompson can get a good price on. He'll always claim it's a step up...a major improvement, but in this case VG-1 does seem to be a bit better than AUS8.