As others have said, this book is worse than the Genki series. However, it also carries over many of the same problems that existed in those books. For instance, the English is totally broken. Some confusing English could be excusable, as for some reason none of these books opt to have a non-Japanese editor as far as I can tell. Unfortunately, this book has such bad translations that often students such as myself could do a better job, even with our limited knowledge. For instance, in one chapter the word "ichiban" is introduced. This word means first in a literal sense, but also means best when used in a lot of sentences. However, the book translates it as "most" in the vocabulary section. This may not seem like much, but imagine a chapter with around 80 words in it, then imagine that around 30 of these have similarly bad English counterparts provided. Moving on from this, the Grammar section is atrociously bad at explaining, with some forms not having any explanation whatsoever, and others having only tiny blurbs, barely telling you what they do, let alone how to use them properly and when they work and don't work. Also, the English, once again, is awful. Not only is the grammar off, but they don't even use words properly. Far from merely being awkward in their construction of sentences, which they most assuredly are, they make plenty of flat out mistakes. If you have any choice in the matter, I would steer clear of this book. In fact, if you had to choose between a course using this book and a course using another, you would probably be better off picking the one that doesn't use this book. It is set up for courses that involve repeating the same dialogues over and over, and placing your own words into preset conversations in order to "learn" how to speak the language. It is firmly rooted in the "just memorize it without thinking" school of "teaching" and avoids like the plague actually informing students of how the things they are memorizing actually work, let alone what they actually mean. As a college student, I had hoped that such intelligence insulting methods of teaching would not have been used on me, but I guess I was too optimistic. This book makes learning significantly harder than it needs to be, and you should avoid it just like it avoids scientifically validated teaching methods.
If you need more reasons why the book is bad, the kanji you are expected to write, which have been moved entirely to the workbook, have no hiragana written next to the words they are in on those pages, so you have to either already know that word, or find it in the vocab based on the characters, adding an extra step to an already tedious process. Furthermore, there are nearly no examples given for these characters. This becomes strikingly obvious when comparing some characters that were in both this book and the Genki books. These characters listed both pronunciations, and several words in the Genki books. In the new book, they list only the pronunciations used in the vocab words, and only the words in the vocab that these characters are in. I have even seen characters I knew from Genki in other words reappear without any reference even to them having the pronunciation that they had in those words.
Also, if you liked the layout of the Genki books, prepare to be amazed as it completely and totally disappears in favor of one that doesn't even label whether a verb is a -ru or an -u verb, let alone anything else about a word. The engaging dialogues have also miraculously disappeared, only to be replaced by the same boring rehashed dialogue every single chapter, as generic forgettable characters go through asking their teacher's for stuff, talking to classmates, and doing absolutely nothing interesting or engaging ever.
If you somehow need more reasons, there is no English to Japanese dictionary, only a Japanese to English dictionary. Also the dictionary no longer has the convenient top bars that it had in the Genki books, which allowed you to easily get to a certain character or letter without much trouble. Instead, there are only breaks at each consonant, if you can imagine, so you can look forward to spending a long time combing through the dictionary if you ever want to find out what words you are supposed to know, and to know how to use already, which a regular dictionary unfortunately can't tell you. If your still here, please don't buy this book, it is not a good product, and definitely not worth the money.