Which one is the best invite system ?

[justchecking]

I installed one from Mr Snob, but with no offense to anybody including Mr Snob it sucked.
Users would click on the link sent in invite link and it would still say - invite needed to register.

What should I try now. Psionic Vision's mod. Has anyone used it on a board running 3.6.x
thanks.
jc

[Triky]

I suggest you to try it in local.. I don't know if it will work on new vB versions.