No, I tried to convince a few customers to implement it, but they seem to want to manage their users manually, so sadly, I have never been able to try it.
I hopefully have some projects coming up where the volume of traffic is going to mean that the site has to have this implemented, so if I do manage to get it up and working, I'll let you know. On the other hand if you succeed before I do, let me know.
Jason's explanation is quite concise.