Jukka was amazing! He was incredibly understanding and always willing to help students during and outside of office hours. He was also willing to give extensions when you asked. His exams were VERY fair--if you understand the material and homework, you will do great. He made the class super simple. The material itself starts out pretty simple (simple diff. eq. stuff) before it devolves a bit and gets harder, but he made the class relatively easy. He's passionate about math, too, and you can see it in his lectures. He's definitely my favorite math professor at UCLA, hands down. Highly recommend taking the class with him!