Some of the main features that sparked my interest for this addon include:

• Random Usage of your entire mount and pet collection
• The ability to blacklist certain mounts (for those just going for the X number of mount/pet achievements)
• The ability to blacklist non-epic mounts entirely
• A “smart mount” macro that will choose a flying mount if you can fly, or a ground mount if not

Its nice because I never remembered to have a vanity pet out, but now it will do it upon login, as well as zone changes (summons, instances). It gives you a bit of variety, and  you dont even have to think about it.