This is one of the most versaTILE (pun entirely intended) things that I have gotten as a DM.  The tiles can be used over and over in different combinations without seeming familiar.  There are a good variety of generic tiles that will not make a person think "Oh, I've seen that rock formation in the last encounter."  However, there are also some unique tiles that give players a sense of importance when they see it.  With the right settings and plot, you could run an entire campaign with just this kit.  It should be noted, however, that this works great in conjunction with the other Master Sets (I personally use the dungeon set as well) to expand your settings.