Summary: I've resisted for 20 years buying one of these, but I finally did so I could make long exposures. It's not worth it to me to take a chance with a crappy $10 cord that might waste more than $45 of my time if it croaks on me at the wrong time.
Excerpt: So you want to mount your Canon Digital SLR on a tripod to get better digital pictures. Excellent - now you need a way to trip the shutter without moving the camera. You could use the camera's built-in self-timer, but your subject may be long gone until it fires. The Canon Remote Switch RS-80N3 may be the answer for you.