I've used it until about a year ago. In theory it's pretty good, but it never reached critical mass. Sites were not using it, because it didn't pay off and user

I've used it until about a year ago. In theory it's pretty good, but it never reached critical mass. Sites were not using it, because it didn't pay off and users weren't using it because you didn't have enough sites. Most things I used it for was blogs, quite a few of the ones I had in my RSS reader have/had flattr, and I supported them that way