We can already notice a difference in the page speed. Had a minor hickup when installing. E-mailed support and got a fast response and they fixed my problem. Happy so far! Detailed on how much improvement they got us on the pages most visited by our customers. We went with the pro version to speed things up even more. Once again happy so far.

The proof of the pudding is in the eating: the pro version has made our site 64% faster according to the stats!

We have been using a range of apps to reduce image sizes, lazy load pictures, defer loading of js and basically optimise the loading time of our site for a while now. But even if you really work at it, (and believe me we have!), you still lose customers because of page load times. Every extra second it takes for our site to load costs us money.
Simple as that.
And mobile users are even worse than desktop users!
But sometimes you stumble on a service you can't quite believe works and I think this is probably one of them.
We tried out the free version for a couple of weeks and then switched to the paid version which basically paid for itself within a DAY!
No idea why it's not 5 times the price but for us it's a no brainer. Five stars from us :)