I received this manual pump in a breast pumping supplies kit that I bought. The kit did not originally come with an electric pump. I have had to use this manual pump many times, but especially before I started using an electric pump. The manual pump is easy to use and very easy to clean; however using it does get very old very fast. It is a lot of work and my arms wold get very tired when pumping. I pump milk for my babies up until they are about 6 months old. I could not imagine manually pumping my milk for that amount of time. This pump is great for traveling purposes and for storing in the car. Just in case I have forgotten my electric pump, I can always resort to this one. The whole process of pumping is simple, yet I have to always remember to keep the pump tightly up against my skin during pumping. If air gets into the pump, then the suction will decrease and not much milk will be dispersed. It is a great back up pump!