I like that you can set up your own rules for who gets notified, as well as what they get sent when someone clicks through from their referral link! It's not very intuitive to use at first glance but once you figure it out its great. You also need to have an account with them in order to do this so if you're looking into something where people are going straight away without having heard of or used before then tap forward might be worth considering - otherwise just stick with emailing everyone yourself :) There isn't anything i dislike about using tpfwd though, everything works fine and looks pretty easy too. We've been able to send our new clients information via Facebook which has helped us grow our business exponentially since we started doing it last year.