Has anybody ordered any of the cheapo knockoff SNES controllers on Ebay that go for about $5 or $6 per controller if you order two or more ?

Do these controllers suck ? Are they basically 95 percent as good as the real thing ? Or do they just feel slightly off, and it's just not the same thing ? It seems that authentic Nintendo made SNES controllers are about $15 or more each, used. These knockoffs are about 1/3rd the price brand new.

Do you guys think the Knockoffs are good enough ? I'd hate to pay triple the price and "hope" that I actually get a used SNES controller in good shape.