I've heard bad things about the US Military machete (thanks, CK!). Anyone have real-world experience with the Cold Steel Latin Machete or some other South American machete? Or maybe just tell me what sort of things I should look for in a jungle-ready machete. Thick/thin blade? Heavy/light? Stiff/Flexible? I'm mainly looking at hacking my was through thorny, 1/4 inch thick vines and dead underbrush.

Thanks.
-Blast