I like the fact that it is easy to use, user friendly, and has all of the tools you need to run successful campaigns. It is not as intuitive as some other programs out there, but it seems like they are making improvements every release. I also love the flexibility you have with Iris. You can easily customize your own campaign and then export that to send to clients. The support team is really great, too! They are always willing to help out when we are having issues. As far as I know, this is the only program that allows you to create custom landing pages instead of just using templates. We have been able to save time by doing things like creating our own surveys, and also sending them to clients without having to ask them to fill in a survey if they don't want to.