Cold steels folders in that class are very strong.
Not smooth opening, or nice fit/finsh. But the blades are ALWAYS SHAVING SHARP out of the box. I could never carry one, who can after carrying sypdee, BM, MT, and other high-end production knives? Zytel is never gonna feel like good g-10, aus-8 is never gonna perform like 440v or good ats-34. But they are not out of the picture for most guys.
Cold-steels folders are being knocked a little here and though I don't carry them, for the money you cant find a better knife. Spyderco enduras locks ARE NOT going to take as much pressure as a cold steel 4" voyager lock. Overbuilt folders, yes. And they sacrificed alot of things to get them like that. Enduras sure are nicer to carry and more easy to use, but if you looking for downright strength and durability (not the edge, just lock/knife components themselves) I dont think anything on the market can beat a CS voyager or gunsite lockback, in those aspects, for the money. And I dunno what you think constitutes a "thick" blade, but the CS folders don't have thin blades by any means. GO ahead and beat that thing in your garge on the back of the blade, I dont think she will close up too easily.
Guys I am just ranting because I think CS folders get a bad rap on this forum, and it is easy to see why. Not everyone here can afford to drop 2 bills on a new folder every week (or MORE

) myself included, and if all you got is $40, and you need a stronger folder before you need a smooth/cooler folder, CS is probably the company your gonna go to. The gunsite folder is a mammoth thing, but I pity the fool who gets that blade coming down on their forearm.
JC