Totally dependent upon the quality. There are poor quality knockoffs, and good ones. These were clearly well made, good ones. And both are still going strong over a year later. A $3 T-shirt that holds up in the wash is much better than a $1 T-shirt that doesn't.

I've bought Junk "Rolexes" for 50 RMB, and High Quality Patek Philippe mechanical copies for 180 RMB. The more expensive Patek Philippe copies were clearly the better deal - they work and look like the real thing.