Pretty cool.
You sure don't see stuff like that on a road bike.
I haven't used a mountain bike for a LONG time. Mine got stolen and I just never replaced it. My career was changing at the time and riding the off road bike always meant putting it on the car and going out of town to ride. Just too time consuming so I ran and used my road bike for exercise. Sounds like Phoenix is a great town for a fat-tired bike.