As a fan of World of Darkness fan, I like Vampire 20 and Hunter 20 a lot, and I adore Werewolf 20, I've read the first edition of Mage: The Ascension and so I was very hyped to get M20.
M20 is great, the book is superb, explains well to tellers and give a crapton of options. Your players want to play tradition mages? It's ok. they want to be orphans? They can. They want to see how it is when you're a techno? It's also aviable!
The book is great and I love how much they use examples or details (like the book of Shadowrun 5th) to understand most.
The only thing : don't use it with beginners players. Mage is hard to make them understand there are much risks.
[5 of 5 Stars!]