I'm currently using it (so I have no score for you to base anything on🙂) and kind of like it. I won't say that I couldn't live without it, but it is a nice addition to all the books I have. Plus it is a Qbook that you can take with you and seems to be more study oriented than Kaplan's Qbook (a few more mnemonics and such that is test-oriented). I will say that some of their questions make quite a few stretches and there are a few errors (this is first aid team we're talking about) but not that many. Also, I really love being able to actually mark up the questions and take notes next to the answers.
Overall: If you feel like you need every question known to man and you want a book that you can do your questions in, decent choice. If you are looking for the something better than UW...sorry, keep looking.