Got this for the guy that takes care of our fence rows - yes we have those old fashioned stone rows that separate fields.  The weeds and vines make me crazy and in the old days they burned them off but no longer can we do this.  Anyway - he used this only once thus far and he likes everything about it.  He said it's a bit of a contraption to get on your back when it's loaded with liquid but once on and the weight is distributed evenly it's nice to be able to walk around the perimeter without returning for more liquid in the 1 gallon container we previously had.