I love it, just for reading. He writes like a teacher in a classroom making you think, and brings in a lot of verses that bear on any topic, and lists all the same words in the original language that apply to the topic, and lays out the various positions and questions in a logical way. Thought provoking and seems especially geared to learning Reformed theology for new students.
It is more intense than Grudem- if you want an ST to use in a group where people don't read much, I'd stay with Grudem. It has less history than Culver's (which is also a pleasure to read.)
So the question is, how do you want to use the ST? For your own reading and study, yes. For the average Sunday school class, may be too much.