I bought this book in order to review first year Japanese after having been tortured by the Jorden series (volumes I and II of Jorden's Solipsistic Language), and I am happy to be able to affirm that, yes, in fact, as we all suspected, romanji are completely dispensable and even distracting. This book gives all examples in real Japanese, not some pseudolinguist/ cultleader's private language.
I think that NAKAMA provides fine explanations and lots of good examples. It also begins early on to show the kanji for vocabulary (written in hiragana), which makes this a good book for both learning and review. There are questions here and there, for example, why do the authors claim that Japanese has two tenses, "present and past", and then go on to explain that the present tense is also used for the future? I myself find the perfect/imperfect (completed/incompleted) distinction most intuitive. Anyway, these are minor issues which are naturally open to debate.
However, there are a few formatting problems (who in the world does the proofreading for this publisher? does he/she still have a job?), and the book is WAY too expensive, as a result of the reigning textbook tyranny from which college students sadly have no means of escape. (oui, huis clos!) What bumped my review up to 4 stars, I must admit, was the high frequency of pictures in chapter 3 containing that truly indispensable creature: kirei na neko (sorry for the redundancy). Hai!