I used the plugin on a client's site, after they had issues with a caching plugin they were using, specifically compatibility problems with Gravity Forms. Not only does it not have any kind of conflicts with the other plugins installed, the performance is just terrific.

Load time is down by 25%, page size by 50% and requests by 70%, all with just a few clicks. Pagespeed score has gone from 78% to 87%.

In my opinion, the plugin is worth at least every penny it costs.