The sprayer and it's operation works as expected and I've used it to spray my fruit trees twice now. The assembly was a bit of a project though. The black plastic mold that forms the base of the unit was very badly formed. I had to drill out the holes to insert the axle for the wheels. Also the hole that the cart handle goes in only allowed the handle to be inserted 3 inches. That had to be drilled out also to remove the excess plastic. There is a small pocket on the lower back that I assume is for the many nozzles but I think you would lose them as they would fall out. A better option would be a drawstring bag to hold all the extra parts not in use. Also the wheels are not pneumatic but are hard rubber. If you use it as a cart sprayer the backpack straps will interfere with the wheels so it's not quickly interchangeable.
Other than that I added a 90 degree elbow where the hose attaches to the tank so it doesn't stick straight out and am working to assemble a 6 foot extension wand for the brass nozzle to extend the spray higher into my trees.