Well, I couldn't resist the temptation to see just how bad a $5 knockoff of a $200+ folder really was, sooooo... (I did this with a bicycle years ago and was pleasantly surprised!).
Here's what I bought: Tac-Force TF-768BK (a DPx HEST folder clone)
Specs: OAL=8-1/4 w/o glass breaker, Blade=440 stainless 3-5/8, Closed= 4-9/16, Blade Thickness= 3mm, Handle Thickness (powder coated AL3)= 1/2", Liner Thickness=1/16" each. Been on vacation, so can't test Rc, but I'll ping it when I'm back in the office. Made in...CHINA...
Initial Observations: Out of the box it's SHARP! Hair shaving sharp. Seriously. It lasts okay and is easy to resharpen. Bottle opener works as intended. Glass breaker does the same. Hex bit driver doesn't fit a 1/4 bit (liners don't line up with scales close enough. can solve this easily by running a 1/4 hex broach through it, but I'm not at work. those without a broach are screw-ed #1). Assisted opening is slow but functional. Powdercoated, aluminum scales are slick as doggy poop when wet. Thumb stud hangs up on your pocket at draw. Pocket clip and pocket clip location are garbage (cruddy location, tip-up/right hand only). Every screw on it was loose. Ergonomics are fantastic as is blade profile. Overall workmanship is quite good. All grinds are crisp and even, and everything functions mostly as intended. I've beat this thing like it owes me money, for the past few days (it's a $5 knife after all) and I've come away pleasantly surprised again. I've had to sharpen it (cutting copper wire and cardboard ain't easy) and tighten the pivot. I've removed the blade 'flipper' (just don't like em). I removed the original clip and installed a deep-pocket clip mounted for tip-down/left hand carry. For a 'beat it n forget it' knife, it does just fine. For $5, it's all you would expect and a LOT more. All of it's detractions aside, for $5 you will be VERY hard pressed to buy better. Would I stake my life on it? Sure, if it was all I had at the time. Would it be my first choice? Heck no. But, we all need to keep in mind that not everyone has even a spare $20 to throw down on a knife. It's superb for the money.