Feedback on Manhattan GMAT Guide(Strategy Guides set of 8 )

GMAT Pros, Can anyone please let me know your inputs/review/feedback on Manhattan GMAT Guides? Are these good to start the GMAT prep? Thanks, Vijendra

GMAT Pros,
Can anyone please let me know your inputs/review/feedback on Manhattan GMAT Guides? Are these good to start the GMAT prep?

Thanks,
Vijendra