Quoted from Pinwizkid:
I bought one, used it once, and immediately sold it. I lifted a Whirlwind up a flight of stairs and thank god someone was there to help me otherwise I would have dropped both the machine and the Escalera down the stairs. It feels like the thing is going lose grip and fall the entire way up - very anxiety-inducing. I couldn't negotiate getting over the top step properly without shifting the weight of the machine in a direction that I was positive would cause a disaster (so again, thank god I had a buddy there to help lift up the final stair the old fashion way). Maybe I'm just super weak/out of shape, but it destroyed my shoulders and upper chest. I was sore for days after using it. However I will admit - my back didn't feel a thing!
Sorry to be so negative on it, but after reading all the positive comments here, I figured I'd play devil's advocate. Looks like it was just me who sucked at using it!
did you try it first without a 300lb machine on it? or just first attempt wing it?
I have one and agree with a lot of people that it is a back saver but does need some practice. I went up and down a few times empty and with smaller stuff to get a feel for it. I also make sure no one is below it in case something happens. and i NEVER let my friends operate it or borrow it, that could be disastrous.
I also had a almost hard lesson where i was on the main floor (linoleum) and in my socks. As soon as those little legs took over i started SLIDING towards the stairs, if it wasn't for a friend reaching over the railing and balancing the machine, it all woulda went down the stairs on its own. Shoes or bare feet from now on.