For the layman, the reading can be dense at times but is never beyond understanding. This book can be used as both a primer for Constitutional Law or a study reference for a law school class.
I recommend this book highly; along with Calimari & Pirello's (sp) Contracts Hornbook (for contracts), Chemerinsky's Principles & Policies is one of the finest supplemental texts available for a law school class. Don't wait till the final to pick it up...