i have used nuk electric pump but this kind of "electric" pump is not really fully auto, it required u to "release" the pressure manually, it only auto "suck", so it's not good to me, difficult to use and feel painful too. If with same $$, I prefer you to buy a hand pump and not to buy, use your hands only. Both ways are good and convenient. (I only used hands at work, no need to bring so many parts) If you have a bit more $$, buy a medela swing (but single), or ameda (double), you will find it worth. (I use ameda at home)