I've been using it for years but it seems to do absolutely NOTHING about the spam problem. They don't even tell you what is done with the reports. In some cases they refuse to get the reports to the appropriate ISP, meaning you just wasted your entire effort. I'm almost done with them because it seems like all the benefit goes to SpamCop and zero benefit goes to me (who is doing all the actual work). They need to be a little more forthcoming about what is actually done with the reports you send to them, besides wasting the time of the people doing the reporting. They need to be a little more active in blacklisting the servers that generate spam, especially those which are sending spam that is attempting to extort money via BitCoin. The stupid ISPs who can't get their act together should get out of the business they're in if they can't maintain a halfway decent level of security on their mail servers and not whine to SpamCop if they are blacklisted.