I've got one on my 1 ton Chevy. Best money I ever spent. I did make a couple of minor modifications while installing it. First, I installed the power unit behind the seat, rather than under the truck where it'd get all munged up. Second, I built a subframe under the bed for the lift arm to attach to. Attaching it to the sheetmetal ribs on the bed just didn't seem like a very good idea to me. Third, I drilled and tapped the pivot points on the scissors lift for grease fittings.
I've had it over 10 years, on a single battery system, with absolutely no problems whatever. My box is about worn out now, and I intend to replace the box with a flatbed, and still use the existing hoist.
Picture attached.