Hi shinewine,
I took the online course (
Manhattan gmat). So I got all the guides. You must be already knowing that there are plenty of different guides in both Math and verbal- Kaplan, Princeton.
if you want some feedback on the Manhattan guides, here it is.
Verbal
1. Sentence Correction - exceptional, everybody appreciates. If you are weak in SC, this SC guide may solve your problem
2. Critical reasoning & RC - guide is not huge, not enough material. I guess, No guide has enough material to cover everything. Strategy explained is a little different (diagramming). But I think it is difficult to have strategies in CR and RC. one strategy will work for one person but not for another.
Math
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Number Properties - good. you will find good reviews in general abt this guide.
Word Translation - I was weak, felt it useful, includes Probability & Stats
Equations, Inequalities, VICs - again I was weak, felt good
Geometry - good review of your basics
Fractions, Decimals & Percents - ok. this topic is important. if you want to save money, you could read the same from somewhere else.
Don’t get me wrong since I have mentioned all goodies about all the guides. Suit yourself. Good luck