i love my 6incher although its some times hard to carry as its so long (it's scary long, nearly as meancing as my safe keeper 1...). In fact I can use both my hands to hold on to the handle like a two handed sword... The reach is terrific in a fight and the shape is great for stabby stabby action!
-lock up is very tight for mines (no play at all)
-I hate using the thumb screw to open it as im afraid ill slip and cut my thumb to the bone
-barn none the sharpest out of the box knife i have ever owned
-can flick open in a fraction of a second with a snap of the wrist and the use of the quillion to open from the pocket is just as fast (it will rip up your pockets if you don't do it right or do it too often... meh its an acceptable loss for me as the speed of opening it is worth it plus i never really use that function unless its an emergency and then at that time, who the f cares if i tear my precious pocket???)
-you can adjust the opening tension via a torque (sp?) screw which is nice
-not as heavy as you would think from a 6 incher
-the frame lock is very strong (some say the strongest every made which I dont doubt, no ways will it slip close on you) although closing it is some what awkward with a single hand (can be done though but due to the size and sharpness of the blade, it just always makes me nervous when I do)
-so fken cheap why not buy one?
4incher (civilian), 5incher (safe keeper), 6 incher (ti-lite)
Like engines, there is no replacement for displacement...