A number of Post Status members have talked in Slack about WP Rocket, discussing whether it was a worthwhile caching solution.
Steven Gliebe tested it for his new Pro Plugin Directory project. He shows the graphs and summarizes like this:
Time is money and I feel that compared to how much time I spent configuring W3 Total Cache on other sites, the cost of WP Rocket is justified. I don’t doubt that other caching plugins for WordPress can achieve similar results, but I am not sure if they can do it with as little effort on my part as I just experienced with WP Rocket. It’s also nice to know that technical support is available, something I am not confident about with the free caching plugins.
That's a good point. If your host doesn't offer caching catered to their platform, WP Rocket probably is a great set it and forget it option, especially if you enable minification and concatenation.