I should have been more specific. Some of the Joyo circuits aren't just generic copies of Tube Screamers and such. Some of their circuits aren't even modified. For instance, I believe it's the Sweet Baby that directly copies the Timmy circuit. Paul Cochrane's pedal is still in production and for a reasonable price, so there's no real justification to copy it. His circuit is patented (though I guess MXR has some rights to it), but the Chinese don't honor patents.