The Stumps Monster - Any Owners?

I was looking at the Stumps website this morning and looking over the cookers. I saw the one called the Stumps Monster, which I am sure you're familiar with, but I've never actually seen or heard of anyone that's used/owns one. This has lead my mind to wander and curiosity is getting the best of me. I'm wondering things like:

What are they like to cook on? Do they move easily?

Frankly, I just want to hear about them in general.