I recently had a compression test done and shes running a little low

I've been told by the wife that a full engine rebuild or new engine is out of the question until the Apocalypse! After a little reading yesterday I found 'Ametech Engine Restore', has anyone had any experience with this stuff? Is it worth putting it in her engine?
http://www.ametech.co.uk/" onclick="window.open(this.href);return false;