Not As Good As NIV Study Bible
The NASB is a more literal translation than the NIV, but my rating is not related to that.  Most of the NASB study notes were taken from the NIV Study Bible.  Unfortunately, a lot of them were watered down and/or are not sufficient in the NASB.
Simply, it is the best GMAT Sentence Correction among those of the Princeton Review, Kaplan, Arco, Nova, and Veritas Prep. Just buy this SC and the GMAT official guide, then you are set.