
I love that I can create forms for people to sign up (like to volunteer for an organization), can have both free and paid events, can do mass email without extra costs, and can even do memberships (free and paid). If you have an organization where you have employees/volunteers contacting people, you can even keep track of all of that on their record; This allows the next person to know who spoke with them last, what was discussed, if you missed them and left a message, etc. Review collected by and hosted on G2.com.
Sometimes upgrading can be difficult and you end up having to start with a fresh database and import in all your SQL. I also run into issues sometimes and find it difficult to get support for it. Review collected by and hosted on G2.com.