I love this mop. We've had it for about a year now. I use it daily and have never had an issue with it. And I can easily mop my floor with plain vinegar and water, instead of using chemical cleaners.
I have used this for 8 months now, and after some vinegar leaked from the pump mechanism, the steel bar inside the pole rusted and jammed up the pump. To fix, I took this apart, coated the bar with WD40 and Vaseline, flipped the bar upside down so the non-rusted end was close to the pump, cleaned the pump, and it was as good as new. If the bar were made of aluminum or plastic this problem could be avoided all together.