I own the 5th and 6th edition of CoC and have been playing for several years. The 7th edition of the Keeper's Rulebook is massive and has many changes from the 6th in terms of art, content and rules changes. The spirit of CoC, of course is still the same. I feel like the art, layout choices, information and overall presentation of information in this guide are very solid and a slight upgrade from the 6th (which I love btw). Even if you decide you want to stick with an earlier version of CoC I recommend buying this guide and picking and choosing which rules and information you want to cannibalize for your game. Several rules tweaks, such as "pushing" (attempting to reroll a failed skill check, but with the added risk of some type of adverse effect if you fail again) are brilliant.
[5 of 5 Stars!]