Hmmm...never heard of that one. If it's anything like the Kaplan Review Notes I am using, I'd stick with ExamKrackers or Berkely Review. Those seem to get the most praise on these forums and users who used them seem to do quite well.
Might help to know a little more about that specific Kaplan book though, I never came across it before. So it might be decent for all I know. -2 cents.
Edit: I just found it on amazon. Ah so it's an advanced book. If you're scoring really high as is and just need more practice it might not be bad. Though I heard Princeton Review and TBR can also give some very difficult passages to learn with. So they may help too. Hopefully someone more knowledgeable can chime in.