I am interested on if the book providing you with lots of information for the sake of being informative, or provided you with lots of information that has/will help you enjoy rocketry more in the future. Information is great, especially when you get more enjoyment out of it. Thanks.
ah - in that case it will suit you just fine. overall I'd give HMR 2 thumbs up - it's a must have for every rocketeer. it's an entertaining read and a great reference book too.
7th edition is only slightly updated from 6th edition. biggest changes are in MPR coverage and payloads (electronics).
I read "THE" handbook in preparation for mentoring teams for the TARC competition. Even if you have a lot of experience and think you know it all (and I don't) it is a great book. Every rocket enthusiast should own a copy!