I have been exposed to Learning Express before and think it is a wonderful tool.  I just took a test on 4th grade math skills.  It has good questions and I like how it gives immediate feedback when you are done with the test.  That is just what kids need so they can see what skills they need to work on.  I also downloaded an e-book on fourth grade testing.  It was easy to do and offered a lot of helpful information.  This would be very beneficial for parents preparing their child for school testing or even teachers looking for resources to use with their students to practice for the "real thing."