I had read Swedenborg's Heaven And Hell some time ago and thought it was a decent book, albeit somewhat delusory. This one I probably liked better, but it wasn't free of the same problems. There are some pretty profound ideas though. I especially liked Swedenborg's spiritual analogies (he calls them correspondences) between light/heat and wisdom/love respectively. He later on (specifically in section 9 -probably the best part of the book), makes a further analogy between love and wisdom and the heart and lungs. I must say that analogy sparked my interest and I thought it a profound notion. Some of the book suffers from contradiction, vain imaginings and theology that has more in common with Kabbalah than Christianity.
As with the Christian mystic Jacob Boehme, I have some amount of ambivalence towards Swedenborg. He can be profound, but also deluded. I do believe it is worth reading him because there is some gold among the dross. But I would really only recommend writers like this to Christians that are more mature and not easily given over to vain speculation.