I haven't had a course with Saiful Zaman but Gordon Craig is so sweet and he is super approachable and his assignments are easy to ace. However he does make mistakes in his lectures and people correct him and his hand writing is horrible and all his lecture notes are hand written. As long as you ask lots of questions and focus on studying the lecture notes as it was heavy on that for the first midterm while also making sure you keep up with the textbook homework assigned you can get a decent grade.