This was the required reading for the course Reality, Being and Existence: an Introduction to Metaphysics that I took online through Oxford University's continuing education department. I didn't read the whole thing, but I read more than what was required for a couple of reasons.
This book is well formatted and laid out to make it as easy as possible to read, physically speaking. The fonts are clear and well distinguished from each other. There's lots of white space, which aids reading. It's well organized. And although it's hefty, it stays open without a lot of forceful folding back of the book to make it lay flat...for the most part.
The introductions are also well written, so much so that unlike with Philosophy of Mind's required textbook last year, I actually read these ones. And I read more of them than required, and I reread a couple too. Although I didn't like the sans serif font for reading several pages of philosophy, the font did help one visually tell apart the intros from the essays while riffling through the book. The introductions also nicely summarize and add to the essays contained in the sections they're introducing. And because they appeared at the start of each section instead of all being bundled together in the first pages of the book, it was easy to go back and forth from an essay to the intro that discussed it.
The essays themselves vary with the authors. Some are written in a style that conveys complex ideas simply; others are so verbose or thick, one struggles to understand the simplest concept. I liked that the chosen authors cover the gamut of time and we can not only see the progression of ideas but also learn from the greats like Plato, whose ideas still resonate today. A better-than-average textbook.