I love that you can create an account with just your email address, no password required! It's very easy - it took me less than 5 minutes from creating my profile until getting started using this software in our Fan Club events/meetups (and we have about 10 of them).
The tool is great but they need more features like customizing different types or colors so people know what type event their attending when viewing profiles online etc.. Also having better management over all memberships would be nice as well since some are not paying at least monthly which makes things difficult if someone has left suddenly without notification beforehand.