**Disclaimer**
I'm assuming that this is the same professor as Shouxin Dai, a math teacher at UCLA. If I am wrong, disregard this.
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Professor Dai is one of the fairest teachers I've ever had. His lectures cover exactly what is on the midterms and finals, which were pretty straightforward. He really does not try to trick students; instead he tests our ability to use methods and concepts taught in class.

He does have an accent and says some things a little different than what most people are probably used to (like x^3 is "x cubic"). But it's kind of funny and really not an issue. His examples are pretty clear and he ALWAYS takes his time in lectures--never rushed sections, never pinned extra material on us, completely fair in my opinion.

He is also very willing to spend more time on examples or explanations if something is unclear. He really is a nice man and a great professor and I highly recommend taking him if you get the chance. Even if he is the earlier lecturer, it's worth it.