Filter Everything Pro is magnificent plugin! I use it for filtering WordPress posts database of more than 150k posts, with more than 10 custom taxonomies and thousands of terms and it does a great job!
Not to mention, Filter Everything Pro is working alongside the GeneratePress theme like a charm, where other filtering solutions just do not cut it.
The plugin is very well documented and very flexible for customization.
Last but not least, the assistance I received was absolutely exceeding any level of support I have received around here - both in terms of speed, thoroughness and accuracy! The support team was extremely helpful, taking the time to review my entire setup (which is quite complex) and to pinpoint an issue which was related to a third-party plugin and has nothing to do with Filter Everything Pro. Outstanding!!!
I definitely recommend Filter Everything Pro to everyone who needs a good filtering solution for posts, custom post types or WooCommerce products.