This is our website growing every month.
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Website growth means nothing in this context, unless you can prove it's directly related to having AMP pages, as websites can grow for a lot of factors, mainly for the content they have which is still the main and most important SEO factor. Furthermore, already blazing-fast and optimized websites will most likely not need this add-on. This is probably why @JamesBrown (and probably many others) didn't notice any changes, and I'm with him, too. The developer of this add-on made it clear that he cannot guarantee a website growth (even though some websites can get a benefit from using this).