tl;dr: take his class, he is a good professor.

I took professor mills for 131A and 132A. he is my favorite teacher not because of his teaching style but because he is always available and helpful with anything, not just stuff related to the class. he's helped me with administrative issues, help with other classes. he is friggin AWESOME.

his lectures are boring and straight from the book. if you follow the book it feels like he's reading you the book. I wouldn't have gone to lectures (because they're always at 8AM) but he knew me as he knows everyone who doesn't go to lectures and would have been mad at me.

here is the thing: if you need help at all, go to his office hours. in fact, even if you don't need help still go to his office hours. just talk to him about anything, he'll like you for giving a shit about the class because most students don't. plus if you go to his office and talk to him, he'll know what you know and you get an easy pass when it comes to grading because even if you do badly on the exam he knows that you're not that dumb (or maybe he'll know that you're a dumbass).

at any rate, he is an easy grader. I got A on both 131 and 132. 132A final was pretty bad because he gave us the same final as the graduates except we weren't supposed to cover most of the material that was o the final exam. I ended up being able to answer 2/7 questions but if i had known that we would be taking the graduate final I would have studied those sections but meh.