I'm at USD.
I bought the CD version. It's okay I guess. It basically encourages you to take an exam step by step, question by question, so you're not overwhelmed by the entire hypo. It went through a detailed tort example and helped me see how there really were a lot of possiblilites that would score a point on an exam that I wouldn't have necessarily thought of.
But it took 9 hours of CD instruction to get that point. So, if you're really bored this summer, give it a go, but it was a pain in the ass trying to do that during the year and do the reading for classes.
Overall, the LEEWS helped a little on my torts exam, which was a racehorse type. But for other classes, the format doesn't fit very well. USD will be no different than any other school. That is, it depends on the professor and class.
Much more importantly is knowing how to gear your studying for each class. That was my best thing and I scored well. It was crazy, I would talk to someone a couple of days before an exam and they wouldn't even know that the exam was open book. I had been planning for an open book exam for months, creating a checklist and even prewritten answers to certain anticipated questions. Efficient preparation, and not LEEWS helped me do well.
Good luck at USD.