Yes, you get what you may expect and the title sounds like in the first moment: an overview describing experiments in moral psychology from the influences of minor situative modifications having decisive influences on our moral behaviour to all the well-known "trolleology". And Appiah rightly defends experiments in general as a traditional and valuable part of philosophical work. But that's not all about the book. The title is full of ambiguity. The whole book itself is a big experiment in ethics looking for an eclectic way which preserves the best insights of virtue ethics, value ethics, utilitarianism, moral universalism - more or less any important ethical concept presented during the history of philosophy. And it succeeds pretty well in proposing to us an ethics of difficult trade-offs between different values and obligations which takes into account timeless truths of all the mentioned concepts. Looking for the good life in the tradition of greek "eudaimonia" - not just an ethics of social engineering. You don't waste your time reading this book.
This is a refreshing and nuanced book on the subject of ethics in our time. Written in beautiful english it is not necessarily an easy read... But, although very serious, thorough and referenced you might find it most entertaining and enlightening.