As a first year medical student, I have found this book invaluable. Initially I had purchased 'Review of Medical Physiology' by Ganong, and although good, I was overwhelmed by the detail. McGeown's 'Physiology' is extremely manageable, and is beneficial when used alongside a more in-depth physiology textbook. It is useful for an overview and revision guide to physiology.
Chapters are well organised, structured by physiology of systems (beneficial as many medical courses are now arranged in this way). Overall I have found this book inexpensive and very helpful.