Where I work out has a couple. They are cool, but they are very expensive, are set at one incline (I think) and there is no belt drive. You basically set the speed with a tension lever. Treadmill with a good inclince and some dumbells is a better investment imo.
But the way the farmers carry is set up (fixed point and a little leverage) on the HIIT Mill allows you to carry more weight= you look way cooler, which is important though.
In all seriousness I used it a lot when they first got it. I prefer the stair mill and the Freemotion Inclince trainer that goes to 30% incline. You can do everything on that you can on the HIIT Mill plus run, change incline, change speed etc. I Don’t hardly use the HIIT Mill anymore after the arrival of that incline trainer.