The new Fitzpatrick is great. Our school officially issues the Cambridge textbook, but the overwhelming majority of our Extension 2 class bought the new Fitzpatrick anyway.
The new Fitzpatrick textbook has great explanation; from what I've seen, a lot easier to understand than a lot of the other textbooks. It also highlights the things that you should know, such as having summaries of formulas and properties at the end of theory sections when they are needed. At the end of the book there is an entire section dedicated to summarising the content. The solutions are great as well; they offer a decent amount of steps for proof-type questions. The exercise questions come in good quantity and are more than adequate, but the difficulty can sometimes be graded strangely (e.g. the hardest question may appear as the third, while the last couple of questions are really easy). The diagrams are better than that of most textbooks. The book has aesthetic appeal; it genuinely looks and feels nice.
The contents of each chapter sufficient, and the strengths of the book lies especially in the later, harder topics. The only chapter I felt that was lacking was on graphs (chapter 2). The textbook also doesn't throw as many difficult questions as Cambridge does. Also, since it's a new textbook, it has quite a few errors; including getting the equation of the normal of rectangular hyperbolas wrong, and several questions in the exercises.
Overall I think the textbook is enough, coupled with one doing enough past papers. It really shines on explaining the theory. And it looks nice.
Edit: the new MX1 Fitzpatrick is really great too (the only textbook I used the last two years for Extension 1), so if you have experience with that, it's about the same with the MX2 textbook.