Does a lousy failing pump decrease supply? My freestyle at level 9 can't draw milk and I had to add in the manual squeeze Will spectra M1 be stronger ? Any reviews?

One of my friends decided to get Spectra S1 after reading this detailed review: http://livingwithlowmilksupply.com/spectra-breast-pump-reviews Thus far, no complaints. In fact, she found the whole pumping experience quite pleasant. She also appreciates the night light function as she sometimes pumps in the night after feeding her baby in the middle of the night. The light allow her to stay in the room without switching on the lights which minimize disruption to her sleeping hubby. Though bulky, she does not find it a hassle as she leaves it in the same place.