I brought BerqWP a while ago for another business site I managed. I have had it running for quite a while and love the fact that it's simple to set up. The site's speed dramatically increased, and traffic improved. I was so impressed that I bought two more licences for my projects.

The team is always pushing updates and improving the plugin even further. Support has been swift, and this is by far the best plugin for optimising the site's speed.

It's like someone just said, "It's magic!" I believe them; it works and is amazing.
The site loads on mobile in 0.6 seconds (Instant). Google insights report 92 on mobile and 100 for desktop.

For the price, why wouldn't you?