I had spectra and i had an oversupply. My daughter never took an bottle so i donated 8,000oz in 10 months that i pumped to other moms and kept 1700oz for her that i ended up donated cause she still wouldn’t take a bottle until after i weaned her at 14 months. I had let downs with spectra though not with Madela i never got more than an ounce with that one. It literally is trial and error and if you can try more than one i would suggest that. Everyone can only you tell you how it works for them not how it will work for you.