Mine is the efattie. The electric packwheel is a MUCH better option. I loaded mine up at home, and when I got to the trailhead, run it out of the truck, and immediately followed it up the mountain. I didn't 'pack it', I let it do the packing. My tut had plenty of room to park it in the tent when camp was set up. I hunted on foot and left the wheel in camp. Packed my elk out on my back to where I could get the wheel to it, and went to the truck that way. My opinion is, the thing works great for me. 62 years old with some physical limitations, and feel this thing extended my 'on foot' elk hunting for a few more years. No frigging way I could have got my elk out last year by myself without being totally wiped, and maybe losing some meat to the heat. The guys saying they're hard to balance , have obviously never used one. As for using too much energy, yeah they're a workout, but way easier than using your back.....