The only ones I`ve got are the Gerber A/F Combat model and the Cold Steel Vaquero Grande. From what I have read here, the Sifu and SOG PE II have better locks, and the Sifu has better steel as well.
The Gerber linerlock can be spine whacked and white knuckeled open. It also has the worst steel. You also have to carry it in a sheath, as it has no pocket clip. On the positive side, the opening action is very slick and great fun to play with.
The Vaquero Grande is a lockback, but has decent steel IMHO. Mine has a black pocket clip and sits tip up in the pocket. The blade is 6" long, 1 1/2" longer than the blade of the Gerber. From experience, the Vaquero Grande is the least sheeple friendly of the two.
Both knives have zytel handles.
I`ve never handled a Sifu, but I`ve checked out a SOG Pentagon Elite II in a shop, and I like it better than the two megafolders I have.
NILS
[This message has been edited by NILS (edited 02-22-2001).]
[This message has been edited by NILS (edited 02-22-2001).]