Willis is a fantastic professor. 100% take him if you can. I don't have a great math background but after having taken Math 31AL and Math 31B (and getting A and A-, respectively), 32A is actually my favorite math class I've ever taken. Willis explains things extremely clearly and his lecture notes are just fantastic.
Like other reviewers have said, the exams can be a bit challenging, but I found that a key to doing well on them was doing the homework. I think part of the reason he made them challenging was because it was online (covid), and a lot of the questions seemed strange and complicated at first, but they were just concept-based, and if you referred to the notes and the lectures there's actually a very clear answer.
Willis is very clear and friendly, and genuinely cares about general student understanding. If you are confused or have questions, just ask in the chat or go to office hours. I would 100% recommend taking 32a w/ willis.

This class is insanely hard, but this comes from a biochemistry major. I found that this was the one class where I felt like the class time needed to be longer. As someone who learns a lot from examples in math, this class has very little of that. Instead, Professor Willis focused on the conceptual information to get through the material as fast as possible. Honestly, I would recommend watching Professor Leonard's YT videos to be successful unless you're a math god. Also, the entire math department has got it out with math tests being insanely tough. They give you a 24 hour period to take the midterm/final, and you can take as long as you want in that 24 hour time slot. However, this open book take home test gives the professors a free pass to go insanely hard on tests. I personally took around 6-8 hours on the final, when the "supposed" time was 4. Overall, a tough class for everyone that requires hard work and deep conceptual/analytical understanding.

Willis is an amazing lecturer, even in the summer when the pace is ridiculously fast. He teaches linear algebra very well and is super concise and detailed which is extremely helpful. While some concepts may be conceptually difficult, he does his best to thoroughly explain concepts and always does examples as well. His tests can be hard but never unfair, I believe midterm averages were around the 88% and 85% mark, with the final around 80% or so. I highly recommend Willis because he teaches well, is fair, and as long as you put in the effort, getting an A is definitely manageable.

Willis is awesome. Super clear teacher, great notes, and assignments weren't too bad. Sometimes time and paper-consuming but never anything too crazy.

willis was a great professor but his tests were pretty hard especially his final. definitely recommend if you've never taken calc before because he explains the concepts really well, but you're really going to have to understand them to do well on the tests. he does prepare you for them so as long as you show up to class and pay attention you should be fine

Michael Willis is a mad genius. His style of teaching is very unorthodox, so it might/might not work for everyone, but I loved it and I felt very comfortable with the material. Linear algebra isn't as easy of a subject as everyone believes because of how abstract some of the material can be, but Willis makes it work with his very casual and informal way of explaining the concepts. He makes reasonable tests and is overall a nice guy who initially comes off as a little abrasive but is actually just really eccentric and really funny. Willis made me truly interested in the material and I recommend to anyone taking this class.

Michael makes the hard concepts easy to understand. The tests are fair and you will easily get an A if you do all of the homework and practice test problems.

Willis is a hilarious professor with really funny lectures. Tests are fine and not really difficult, but beware: the first midterm is VERY easy (it covers the absolute basics) and the second midterm gets much harder. This is because the material covered between the first and the second midterm is a lot to take in, and you either get it or you don't. I did very well on the first midterm but pretty bad on the second midterm (he doesn't let you drop a midterm like other math classes), so I studied a lot for the final and did really well on that. Overall, just make sure you spend a lot of time trying to understand the abstract concepts of the course - at one point you'll finally hit it and everything will make sense. If you walk into the midterm/final without understanding the core concepts of linear algebra, the exams will be rough.

Willis is hands down one of the best lecturers I have had at this school so far. He explains concepts very clearly and is super engaging with some dry humor added in as a bonus. I showed up to pretty much every lecture because they are very useful. Definitely recommend as a professor. As far as exams go, I believe they are pretty fair. First midterm was extremely easy because there wasn't much covered yet, but the second midterm and final definitely step up the game. I personally got screwed over on the final. Don't think you can mess around and work slower because you have three hours. This mans' final is long as fuck. Has been the only final I have not finished on time. Now for some stats

My scores were: Midterm 1- 96% (Class average: 92%) Midterm 2-80% (Class average: 71%)
Final-75% (Class average: 71%). I got a B.

So as a good bet, you'd probably need to score over 10% above average overall to get into the A range.

I really enjoyed this class. I learned a lot and he made the concepts really easy to understand. The homework was easy and doing it prepares you for the tests. The midterms were super easy (median of 90% on both) so he tried to make the final hard. It was a harder but mostly just long. However I remember the average on that not being too low. Overall a really good prof.