Excellent module. I work with lots of lists for a living and I use this module all the time. The documentation is well written. Code I've written based on the docs always yielded the results I expect. Also, this module seems feature complete in that it does everything I need to do with lists.
A well documented and easy-to-use module for comparing arrays. Even if this module doesn't do what you want, It's thorough review of similar modules in the documentation will send you in a useful direction.