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Former user here. I used it for a little time but honestly speaking, I can’t say that I saw a dramatic improvement on Google PageSpeed Insights. Maybe the theme I was using was a little bit faulty but in general relying on "speed" modules or extensions for performance and speed is not really the best choice. A lot of those “performance” extensions are buggy and causing troubles even with a small catalog and few modules.
Webp images coupled with Redis + Varnish caching is a much better choice.
It works well on some sites, but on others there are conflicts. For example, I have to disable:
Page Cache - Off
Minify HTML - Off
Minify Javascript - Off
Or the site displays glitches, for example, on a PC, some styles are missing, etc.