I had purchased an original Swiffer Wet Jet some years ago and (after learning how to refill the bottle myself) used it regularly. When it finally broke recently, I ordered this starter kit from Amazon.com, and discovered that the design had changed, with some apparent improvements. Unfortunately, the new design also brought with it a defect, namely a tendency for the housing around the screw connecting the handle and head to crack. This happened both with my original Wet Jet that I purchased in April 2011, and the replacement unit graciously sent to me at no cost by Amazon in May, both times after minimal use and without any external cause. For now, my Wet Jet sits idle and usuable with a loose and floppy mop head, and the carton of replacement pads was a complete waste of money.