This is my first attempt at using my Kessler pocket dolly out in the field. I found it easy to set up and relatively easy to move around on my Manfrotto. I did notice that it slows down your shooting as planning your shot takes a little more forethought with a slider.
I don't have any complaints other than my track not being in the best of shape (bought it used so there are some nicks in the track that I'm trying to sand out). I was able to set it up and get some usable footage right out of the box.
If you don't have a slider of some sort...do yourself a favor and get one. You won't regret it!