Ah it's always a bit intimidating when someone says something is part of the essentials when you have yourself only seen a tiny bit of this course material in your program
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One of the authors is at my university and teaches from this book. It's a math heavy upper-undergrad elective course. A couple percent of our students take it, usually in their final year of a 4 year computer science program.
The couple students I know who've taken it did enjoy it. They were also people who liked proof based mathematics in general.