Shadowrun can be distilled into three important words: "Magic cyberpunk noir."
If you're looking for a sci-fi RPG you can really sink your teeth into, this is the one. Shadowrun is quite possibly the richest, most detailed, and most beloved sci-fi RPG setting I have ever played. The way the rules and fiction are presented in this rulebook quickly dispels the "cyberpunk with namby-pamby elves" stigma (which usually originates from people who write off the game without really knowing anything about it). On the contrary, this book makes Shadowrun's world of magic and technology come alive.
This particular rulebook by far the most beautiful and lovingly crafted presentation I have ever seen in an RPG book. Printed in full color, with gorgeous art (the cover alone is fantastic), lavish page designs, and a ribbon bookmark, you just can't ask for a better package. Also included as easter eggs for veteran players are some classic pages of art from Shadowrun's rich, 20-year history (such as the cover art for Shadowrun 1st/2nd Edition rules, the cover of the DMZ box set, etc.)
The rules themselves are another big draw. At first I refused to try 4th edition rules simply because 2nd edition rules worked well enough for me and because they re-branded iconic "decker" characters with the generic "hacker" moniker. For one, I am glad I waited to pick up this Anniversary Edition because this book incorporates errata and important revisions to the original 4th Edition book released a few years ago. I also discovered the 4th edition rules themselves are a worthy successor to the 2nd edition rules (which were first released 17 years ago!) and greatly streamline gameplay.
My only regret is I still miss the term "decker," but in the end it doesn't make sense calling someone a "decker" when cyberdecks are a thing of the past (gotta keep up with SOTA, after all).