Ibn Arabi is well known for its beautiful, imaginative, humanistic, mystical prose (and poetry), which sometimes borders on almost neoplatonic themes and language. However, "The Tree of the Universe" bears not many of these enticing traits, something that could be explained perhaps because it is now accepted by many and well established (see Younes Alaoui Mdaghri critical study of the work) that the text was penned not by the magisterial Andalusian scholar, but instead by Ibn Ghanim Al-Maqdusi, a sufi master from the same era.
I have no other knowledge of Ibn Ghanim as a sufi writer, other than this work, given that unfortunately not many of his writings are available in a modern edition or even translated at all. Concerning "The Tree of the Universe" specifically, perhaps because there were different expectations on the outset, it holds little value to a reader that opens it with the assumption of embracing a sufi treatise with richer philosophical aspirations. Indeed, there's not much intellectually stimulating content to be found, as the text is comprised almost entirely of glorification and exaltation of the Prophet Mohammed, interpretation of his deeds, essence, words, divine calling and encounters. While this may certainly appease to devout muslims interested in learning about the Prophet's nature in spiritual terms, for any other person it will probably lack the interest to make it a worthwhile reading.
The edition I read is from Editorial SUFI and is a Spanish translation from a version by Arthur Jeffery. His initial study probes into the overall structure and meaning of the text, making it very valuable as an introduction. His various and extensive notes spread throughout the main text are also of particular relevance and carefully explain not just the context of the historical and scriptural references that regularly pop-up, but also the origin and applications of many arabic words that in an intelligent move are kept within the text.
"The Tree of the Universe" is a valuable book for a very specific set of people, but despite this worth, which is mostly of theological interest, its theme is a limitation which regrettably may turn tiresome for others, and these readers will find it hard to take something fruitful or particularly memorable from it, other than the inventive interpretation of the Prophet's mystical character.