My dad carries the same knife you're looking at, BUT it's the older AUS8A version. I have owned 2 AUS8A recons aswell, PE Tanto and the Spear. Both worked pretty well, but the tanto opened and closed like a dream. Felt really nice in the hand.
The AUS8A is FAAAAR better than the 440SZQ they use in the newer versions. Takes a better edge, holds it longer, and even feels more stout inthe hand. Maybe they thinned the liners on the new models however. That could be where the difference in weight comes from.
I have used all 3 versions of the "pullbar" type locks, and I like SOGs Arc-Lock the best so far. The Cold Steel lock is ok, many of them have poor finishing on the interior. When this happens the teflon coating rubs/chips away and leave metal on metal. And since the metal is not smooth, to let the teflon cling I guess, it makes for a less that "sweet" action.
The Benchmade is smooth and quick, but I would prefer the lock knobs to be a bit bigger. That is partially a personal preference and part poll info. Most of my friends have tried them and agree that they could be a tad bigger.
The SOGs seem to be the smoothest and quickest opening. And quiet, my Pentagon Elite 2 is so soft when it opens sometimes I have to look and see if it opened at all. I just wish it used VG-10 steel.
Anyway, that's my $0.02