I've only used it for a few days but it works fine. My old charger was a 45w and this new one is a 65w, the voltage is the same as is the polarity. Yes I'm happy with this product, and it has a longer cord.
Did not charge my DELL Inspiron 15-5567 Laptop properly, and was not be recognized by my DELL laptop, so I am assuming this is not a genuine DELL charger even though it looks like one, and could fool someone. It would not even matter if it worked, but it did not for me.