There are many different benefits to participating in Assessment Tours.  It all depends on what your end goals are.

Getting an independent classifier to go over your foal/pony/horse for an honest assessment of your horse’s conformation and movement/ridden or jumping styles, helps you as the owner to find the right discipline best suited to it’s conformation/movement.  And or this helps you to find the perfect home for your horse (if you are planning to sell).  You can use the scores to promote the sale and many people like to buy horses that have been independently assessed.  It really is quite useful for many areas of owning/breeding horses.