Eckhart Tolle was a quite divisive author for me. On the other hand he had very usefull visualizations on the nature of pain that were really valuable to me in difficult times.
The painbody visualization was especially therapeutic to me and helped me to cope in better ways than I would have otherwise.
But on the other hand I find most of his philosophy just bonkers.
The book is bit like "drawing on the right side of the brain" - great exercises wrapped in non value adding chaff.
I absolutely loathed The Power of Now. However I enjoyed Waking Up by Sam Harris that seems to offer a similar message but without all the mumbo jumbo.
The Power of Now - Eckhart Tolle
The Four Agreements - Don Miguel Ruiz
In my humble opinion, these two books alone, have the ability to change one's life.