I had to read 'The Divided Self' for an undergraduate seminar, and frankly, it was a slog. Laing's prose is dense, and the case studies feel incredibly dated now. A lot of the phenomenological descriptions of schizophrenia are just... not how we'd frame things today with more neurobiological understanding. That said, it's a cornerstone of anti-psychiatry thought, so for historical context in psychology, it's kinda essential. You see where a lot of modern critiques of institutional treatment started. I wouldn't recommend it as a primary text for understanding current clinical practice, but as a piece of the field's philosophical history, it has value. Just don't expect it to be an easy or immediately applicable read.
I got more out of reading contemporary articles that referenced Laing than I did from the book itself, to be honest. It sits on my shelf as a 'I read that' badge more than a frequently consulted resource.