I picked this up on Kindle for free (now $3) - it is very readable, but has some depth. What I find useful and interesting is her characterizations and problems with the traditional view. Unfortunately, it seems as though she does not consider Conditionalism, and jumps to Christian Universalism.
As I've come to see in this debate, there are two reasons to question the traditional view, both of which have merit. The exegetical view, as well as the ethical/philosphic/moral view that objects to the harshness of eternal torment - what might be called the violation of the law of reciprocity - is there another name for this objection?