I've been using it for more than 6 months now. It's helped increase my milk flow and made pumping not hurt at all. I pump 4 times a day, every day and it is still in great shape. Very recommended.
After learning about different flange sizes and realizing my Spectra pump only came with two too-large flanges, I bought a 15mm flange after measuring myself. This made a big difference in my comfort as less of my areola was pulled into the flange’s suction. Definitely recommend trying to correct size for you.