I used both CDR and Bootcamp but in the end only stick to Bootcamp. To be honest, I will say CDR is much easier than the real test (with respect to the length and difficulty of the passage). But that does not mean you will not do well for the real test because the questions in CDR are very different than the type of questions in the real test. The most similar ones for RC is Bootcamp and actually it's a little harder than the real test, which I think is good and make me well prepared for the real test.