I absolutely love my Duette breast pump! I have been using the Spectra S1 for about five months and I can say that my Duette pump works just as well, if not better, especially during power pumps. I have been able to pump up to 11oz in one session, which is a lot for me. Using the adapters that come with my silicon collection cups I can use them with this pump, which is awesome! I have always been able to pump more using the cups, as opposed to the traditional breast flange and bottles & the cups are super comfortable.
The Duette offers amazing options that my spectra does not. I can set each side at different levels which helps my slacker boob produce more. I also absolutely love the different pumping phases specifically the rapid and auto loop which really maximize my letdowns. I am able to pause during my pump & resume. The memory function allows me to record my pump preferences & play it back easily for future pumps. The child lock is great, because my daughter is always trying to play with my machine. lol Also, the battery life is good, I can pump a few times before it dies & it charges quickly.
The Duette pump offers so many great features, is small, & powerful. I am very happy with my purchase & would definitely recommend this pump!