I bought this product and noticed a good difference between manual pumping and the double pump.
It is very easy to use. There is 8 different levels of suction. It came with a nice storage bag and two gumdrop bottles. There is this bar thing you can use so you only use one hand while pumping, but i found it hard to use. Instead I pumped with out it. The only thing I didnt like is not as quiet as they make it out to be and i had to order larger flanges because they only included the smaller flange in the package.
If you dont have a bunch of money to spend on a pump I would go with this one just make sure you order the larger flange, the company will send it for free.