He tries really hard but his accent is so hard to understand, and he's not the best at explaining thins- personally I think he spent too much time on basic vector math and not much time on the harder concepts. Tests are fair, but hard. HW is optional but helpful, and there are weekly quizzes in discussion that I personally liked cause it made sure I kept up with the material. I would avoid if you're looking for an easy class but it's not absolutely horrible, he really does care about the students and he tries to answer all questions and make sure you understand.

As a class, 33A was much more logical and structured than 32 so I enjoyed it a lot more. Das is a pretty good professor, super straight-up and helpful when asked of. He's a bit of a character though so people often don't find him approachable. I would say the exams are very doable even if you're not like super good at math. The problems are basically all from the homework problems (including optional ones that I definitely recommend you do) or the questions in the book right next to the assigned problems. I would just make sure you have a really tight understanding of chapter 3. He did rush through the last few chapters too fast but they were pretty superficial so I can see why he timed it the way he did. Overall, if you really get chapter 3 and know the mechanics of eigenvalues and whatnot, this is a class that you can do well in.

Professor Das is one of those professors where you don't really know how to feel about, especially in light of a [certain] student who would frequently eat up about 20 minutes of each lecture asking some of the most disrespectful and rude questions.
Onto the class however, I thought that he really paced by the textbook when going through the lectures, so make sure you get that (it's free online and you can even find the solution guide for all the homework problems LOL). I will agree with others that he writes/derives a lot more proofs than what is necessary, and the examples of "applications of theorems" that he gives are nothing more than the textbook examples reworked. He assigns weekly homework, but, um, we only had five of these through the quarter, as he didn't assign any after week 7 I believe. They're easy enough and good practice for the midterms/finals, so make sure to do the homeworks (they're collected but it seems that with the solution manual, everyone gets 100% on those).
For discussions, I would agree with others that it was really up to your TA. The only common denominator between all the sections is that we usually had a quiz to start out a discussion (just a homework problem so if you did the HW it should've been pretty simple). Like homeworks, one lowest quiz grade is dropped.
Our class had two midterms and a final exam, with the first midterm and final having C averages, and the second midterm having an abnormally high average of B+. I say this because this class is CURVED, and judging by the wording on the syllabus, he CAN downcurve, so it's important that you do well relative to your peers. There are two grading schemes, one being HW 10%, quizzes 10%, midterm 1 20%, midterm 2 20%, final 40%, or the other being HW 10%, quizzes 10%, better midterm 30%, final 50%. Another issue is that because most of the exam problems are just homework problems or a relatively easy proof (that he mentioned would be on the exam), everyone does pretty well so that means the curve will ruin you unless you also do well. Beware that the two midterms have a relatively low point total (20 and 30 points), so one mistake can cost your grade to drop by letters (proofs are the place where you can lose the most points, so make sure to get those!!). However, it seems like most people in his class find this class easy and do well, and you do seem to have a solid knowledge of the fundamentals (eigen stuff, matrix algebra), so Das' is not a bad section to take 33A for.
Finally, Om is a boss with dealing with question guy, straight up. Das will crack the jokes, and I found myself laughing a few times (hopefully it isn't just my humor is bad). Also, he's legendary for only having like three outfits or something, so you know in every possible sense you are getting consistency every day :).

The homework isn't graded, which is nice, and the weekly quizzes are very doable if you did the homework. Tests are challenging and Professor Das isn't the most helpful in office hours. I had to rely on my TA

Professor Das was not great at teaching, he gets really excited about certain topics and starts to talk really fast and no one understand what he is saying. His handwriting is often cursive-like so it was quite hard to read if you sat in the middle-back half of his class.
His exams were pretty standard and very similar to his past midterms, so look in to them when you're studying.
He gets easily distracted by certain students in class, which leads to us not learning about eigenvalues until the very last week before the final.
His quizzes are pretty easy, so don't worry too much about them. He stopped giving quizzes from week 7 onwards, so that was pretty great.
Overall, he is just not good at explaining, but if you can self study and understand the concept, his tests will be very doable for you.

Das has a bit of an Indian accent, but it's quite easy to pick it up after the first lecture. The content is quite hard (but easier than 32B), and at times you may feel it's a bit hard to keep up with everything. I found Das' lectures pretty helpful, which says something considering the experience I had for 31B. For the most part, every new topic was introduced properly, and he made sure that many students understood them before moving on. He also did a copious amount of example problems and potential test questions you could see. As long as you did most of the homework questions, generally the midterms and finals were the same format. Only a couple times a curve ball was thrown, but that was mainly to separate the As from the A-s.

Honestly, I spent a long time studying outside of class and ended up understanding everything but got a B- due to mistakes on my end (not a good test taker here), which made me quite sad. It's partially because I'm a pretty slow learner. Either way, based on the reviews for other teachers, I'd still say he's on the better end.