Sven on Commentaries

Steven Harris has written a useful review of various commentary series' (is there an apostrophe there?). I tend to use the BST, NICOT and WBC commentaries. How do other people read commentaries? My usual practice when studying a book is to start with the BST and read it right through. I don't tend to read the more in-depth ones like that. I fear I would find it too draining. They are not exactly easy. I tend to use them for reference, or work through them as I am preaching through a book. What about you?