Inflexible, expensive, and inefficient platform
What do you like best?
Some handy marketing & content management functionality built in, although difficult to use, and limited in scope. One thing going for Rainmaker is the back-end UX.
What do you dislike?
Incredibly inflexible platform. You'll be limited ONLY to the functionality provided out of the box from Rainmaker, and if you choose to do anything outside of this box, it's either not possible, or incredibly time inefficient because everything has to be manually approved by Rainmaker for each change.
Recommendations to others considering the product:
Stay away from this platform if you have any interest in expanding your site's functionality beyond what Rainmaker offers.
What problems are you solving with the product? What benefits have you realized?
Very few. If you want a durable, long-lasting solution for your business, steer clear of Rainmaker. Wordpress is much more versatile, especially because so many developers are familiar with the platform, which isn't the case with Rainmaker.