Reddit mentions of Yonsei Korean Workbook Vol. 1 (Korean Edition)

I really like my textbooks from Yonsei. I started them with minimal knowledge and learned a lot. I have the actual textbook, which explains grammar points, the workbook, where you answer questions based on the textbook chapters, and the reading book, which loosely relates to the textbook (it isn't 1:1 like the workbook so if I don't understand a grammar point it means I went too far in the reading book and need to catch up in the textbook). I like the reading book the most, the types of questions asked make more sense compared to the textbook/workbook and the reading selections are much lengthier, but it has no explanation for any grammar nor does it have any translation (aside from a few words in each section) so I can't say to forgo the textbook.

This is the first textbook: http://www.amazon.com/Yonsei-Korean-English-Edition/dp/8971417846

This is the first workbook: http://www.amazon.com/Yonsei-Korean-Workbook-Vol-Edition/dp/8971417935/ref=pd_sim_b_1?ie=UTF8&refRID=1P31ANJAWDB4A4MGK7KP

This is the first reading book: http://www.amazon.com/Yonsei-Korean-Reading-Vol-1-Edition/dp/8971417986

You might find them cheaper elsewhere. I have the 1st and 2nd of each. This is literally the only textbook I've used (I've looked through some pdfs for others though) so I don't have anything to compare them, but I could send you some pictures of the pages if you're curious how they are structured inside.