Phoenix Mountains is a unique 'Mountains' addon package for Flight Simulator X (FSX) and Prepar3D. This package features photo scenery imagery of the various mountain ranges that line the edges of Phoenix Arizona as well as the mountains and hills 'in' the Phoenix area, such as Squaw Peak, Camelback Mountain, North Mountain Park, and others. This is not a 'city package', but only a 'mountain' package and serves as a brilliant VFR 'navigational aid' for simmer pilots to fly by. The mountains feature night illumination and Papago Park features some Autogen buildings.
If you are weary of getting a massive photo scenery package of ALL of Phoenix that might drag down frame rates and fill up your hard drive, then this might be a better alternative for you. You get to keep the basic, stock Autogen ground terrain, trees and homes, etc, and only the mountains and hills are treated with photo mapping. Also, you only use about 250 megs of footprint area on your hard drive. And, its a very modest price.
If you want a high detail version of the ENTIRE city of Phoenix, you will not want this. This is 'only' Mountains. Nothing more.