It was okay.
It gave a pretty broad overview of Heaven and Hell. I found it's arguments against conditionalism (i.e. the actual biblical view) not particularly strong. That said, while they don't seem to have a full grasp of some of the implications of many conditionalist arguments, the authors are at least more aware of them (e.g. the connection between Isaiah 34:9-10 and Revelation 14:9-11) than many books on Hell.
In regards to the other topics, it's a bit more balanced and even-handed than many others. Though they do affirm the traditional Christian view of the soul living on past the body after death, they take a more balanced approach to the relevant texts. For example, they are aware that the Hebrew "nephesh," translated as "soul," in most cases (or as some would argue, all), refers to biological life, or the general life force of a being. Little things like this make this give the book a greater degree of insight than many longer books on Heaven and Hell.
Overall, it's worth reading if you like to keep up on what's going on in evangelical theology today.