from what i understand the manhattan ones are the best
I have them and think they are EXCELLENT.
For Reading comp, I think their strategy will blow you away. It's amazing how well it works. If for no other reason, the price of the books is worth it for this strategy.
For SC, they cover a lot of material and a lot of ground and I think they do a pretty good job.
For CR, I think they strategies are no better than anyone elses - but I also dont think theres any real way to teach this - i mean, either, you are good at this kind of logic, or you are not...