The main benefit I found of this mop is that it's light enough to handle with the rod full of water.  It's a clever design and is so much easier than struggling with a heavy hose at one end.  Saves a bunch of trips back to the soap bucket. The simple water fill mechanism works smoothly. The mop end design is gentle on the car's finish.  Can't say anything about durability yet.  The parts seem sturdy enough.  The round knob that is used to push the water out is comfortable.