This is one of the great classics and yet it feels so modern. Freud's analysis are worth reading in the text. Mourning and Melancholia can be read many times over and it is still possible to go deeper every time into the analytic process.
This book is very interesting and filled with ideas that are simply explained without being patronising. This is useful, in my opinion, as with Freud's ideas, things can start to get confusing. Very useful for dissertation work or even simply to personally read to expand ones knowledge.