Well, compared to other people here I don't feel very qualified to answer, but since you had no replies yet I'll throw in my experience.
I never went to Seminary but I love to read theology. I spent several months on and off reading that a year or two ago during a hard time in my life ( mostly Christology and some parts on the Church, but snips of sections all over).
On the plus side, I felt that he could be- without exception- the most beautiful writer ever and it was like a worship experience. In many ways he became my default theologian- ie, his opinion is weighty for me if he thinks something differently than other highly regarded Reformed theologians, like say lapsarianism for one example. So in that sense I think owning his books would be very valuable. He is a very deep thinker.
But, if you want to just pleasure read in the evening for your own edification, his digressions can be overwhelming. He'll be going along on some great subject and the next thing you know you are into the intricacies of every error and heresy and liberal opinion for hundreds ( or 2,000) of years. That is fine for intense scholarly study on a subject and understanding every single whacky kooky twist that ever has been invented, but, it is hard to wade trhough if you just want to read theology and what the bible teaches.
I ended up going back to Culver for my ST reading- I love his ST and all the history, and he does cover errors but he pretty much sticks to the point of what scripture teaches without all the intricate analysis of errors and heretics.
So if you want a resource to study subjects in-depth, by all means buy it. But if it is for pleasure reading, I don't think I would recommend it.
