For the past four months I've been working my way through this grammar book on the weekends. I've found it to be a really good review. It's divided into two sections, one where the grammer and it's rules are laid out in the traditional manner for a grammar book, sentence structure, verbs, etc. and the second half is all based on situational structures, how to express things based on situation and context. I found the explanations quite easy. Though I think this was because there wasn't a great deal of technical explanations. For each instance there was a brief explanation of how it works in Chinese (normally what order things should be) and a sample sentence. I don't think it'd be that helpful as an initial grammar book because there's not much explanation and only one example but as review it's great. It is also good because the sentences are mostly very easy to understand. There is not a huge ammount of new vocabulary in the sample sentences and they are realy easy to adapt to your own situation.
I think it was really good to go back and review this. Though I wish I'd done it quicker as I feel I've already forgotten some of the things I learned. But it will make an excellent reference, particularly because of the way the second half is structured when writing it will be very easy to check which is the right way to say something. I'm really glad I got this. It's definitely helped improve my Chinese.