Oddly for White Wolf books, although there are typos and layout issues, they're strictly confined to a couple of sections, suggesting that the book had last minute changes post-editing. The book is largely ok, though it has the big flaw that it consistently refers to the Burning Times, an event that did not happen. The Inquisition targeted secret Jews and Muslims in Christian lands, as well as Christian heretics, not pagans.
One of the things that worked well for it was that there was a group of apprentices rather than a single one (though there were issues there, focused around the Burning Times discussions) and the Mythic Threads were a good inclusion, though they are mostly subsumed into Reality Zones and Focus in modern Mage.
Overall, a decent book, but nothing truly essential for Mage.