Pros: Maps are detailed and includes topography. Lists many, many, many trails you won't want to miss.
Recommendation: The maps are outstanding, very unusual for a guidebook. The descriptions are very detailed and includes some great photos (black and white). This book also includes trails for Kenosha pass, Jefferson Lake area and the Colorado Trail all the way to Breckenridge. If you are going to ride summit county and you aren't familar with all the trails, you need to buy this book. You won't regret it!
Pros: Includes more singletrack rides than many guidebooks. Great maps with topo detail.
Cons: No subjective ranking of the trails - tough to figure out which trail is the best without reading all the descriptions.
Recommendation: This is a comprehensive guide to Summit County and Vail area singletrack. Many MTB guidebooks (like the Falcon Guides) include crappy fireroad and paved rides but this one sticks to (mostly) singletrack.