As a first year Greek student, I found Mounce's large tome on Introductory Greek, with its verbosity and endless depth, to be extremely intimidating. In my opinion, Black avoids such stumbling blocks for the new Greek student, while offering many outlets and resources for the more advanced student as well. Although there were several places in which my own brilliant Greek professor (Dr. Roy Metts) had to adjust and/or replace Black's instruction (e.g., Black's classification system for Third Declension Nouns is somewhat cumbersome), my opinion of this text remains positive and I would highly recommend it to anyone interested in learning the basics of biblical Greek.
(P.S. Broadman and Holman's printing company did a terrible job in the binding of this book. Almost everyone I know who owns this book has had the pages separate from the binding within a few months. Be prepared to glue it back together!)