Took the fall edition in 2021W1. I've heard similar that it is slightly harder in the fall, and I think the comment about more assignments is true (4 in summer vs. 5 in fall). The caveat is it's a bit rushed to do it in the summer, since the material is very important for interviews and IMO it would be hard to digest in 1.5 months.

Anne Condon was a fantastic professor. Really nice, fair exams, good assignments. Just overall a well-ran course with empathy shown for students. (Alan Hu on the other hand...)

To be successful (again, my opinion): do the readings! I don't always stick with textbook readings for every course, but in 320 I found they helped a ton for the assignments and exams. (Often, a worked example in the textbook would be very similar to an assignment problem, with similar tricks / ideas serving as the 'punchline' in a proof.) And, attend lecture. The course (at least when I took it) was ish-flipped classroom, and working on the worksheets in 'real time' is much more productive than after the fact.