Took my 3 year old daughter skiing, so was invaluable.
A year ago, my cousin had a bad back while teaching his child to ski - has was continuously in a bending over, for several days.
This product means I can stand upright most of the times, while still re-assuring my daughter. I was initially holding on to the handle at the back, and as she got steadier, started making the leash longer. Days later, I was holding the leash at full length, mainly to slow her down - so I can catch up with her.
The handle is a live saver, as it's invaluable when I need to pull her unto a lift-chair, or lift her out of the chair (even used by some 4 to 5 year old children as well).
...and I store some snacks in the little back-pack attached to it.