I worked with a contractor that had one on a remote job site. Interesting little rig; max speed 25mph (governor controlled per EPA regulations). Main complaint they had was that the engine was not sealed well enough for any water crossings, they stalled it after going through 6" of water and had to walk back to town. After a day and a ride back to the rig from another co-worker on a 4-wheeler, they were able to get it started and back to town. I didn't hear if they towed it across on the return or not.
I liked the right hand steering & left hand clutch though, sure works on your coordination; reminded me of when I learned to drive a stick! All the pedals are in the same order, but you are shifting with your left arm instead of right. Although the seat didn't go back far enough for my 6'3" frame, it was a little cramped. A extended cab version may be more of my liking.
At about $5k each without tracks, and the fact you can park it in the back of a full size pickup, it looks like a fun little rig to play with.