Eckhart Tolle was a student of an Australian spiritual master named Barry Long, at some of Barry's London classes. Barry died in 2003, but you might like to check out
http://www.barrylongfoundation.com
It seems to me that Tolle doesn't say anything original at all. On the other hand, Barry was original, although it's also true much of Barry's teachings is based on extending and making practical sense of J. Krishnamurti's teachings -- with some influence also from Raman Maharshi. You may be aware that some claim to know that Krishnamurti (1895-1986) was a reincarnation of the Buddha. (Krishnamurti certainly takes precisely the same position as the Buddha did on literally every metaphysical question, even though his words are quite different.)
Tolle's biggest virtue and uniqueness is that he writes very simply and fluently and in a way that a huge audience can understand and resonate with. But I understand it's hugely expensive to catch him live. I'd suggest that people might stick with the videos. (It's simply not true that being in the physical presence of a spiritual guru creates major transformation in a person. The effects wear off within 3 days.) If you want to go deeper and further into what Tolle is teaching, I suggest you'll need to practice some of the exercises. Barry Long was (far as I know) the ingenious inventor of the "foundation stone" practice which Tolle usually calls "feeling the aliveness" inside you. I've never seen an acknowledgement from Tolle that Tolle certainly wasn't the originator of this. Ditto regarding the notion of "the inner body" and the practice of experiencing it, and also re "the pain-body", which Barry called "the unhappy-body".
These practices are very important because Krishnamurti argued very persuasively that he had discovered some ultimate shortcuts to achieving happiness, and exercises such as "feeling the aliveness" are Barry's ingenious practical applications of what Krishnamurti had proved in theory but didn't manage to make concrete.
Unfortunately, Barry decided to add the application of his exercises to "making love", which he saw as a very important way for people to make these things practical and to "make sense" of them. I don't believe everybody understood how to apply them to making love. Tolle leaves any Tantric stuff out, and to me that makes better sense (ignoring the pun on "sense").