Medela hands free pumping bra anyone?

Does anyone use the Medela hands free pumping bra? Does it work?

I’m so tired of trying to hold these things in place for 20+ mins. Most of the time I don’t last that long because my back hurts soo bad. I assume that’s just causing a reduction in milk as well. But my back hurts soo bad

Does the bra work? I bought 2 from target but couldn’t get either zipped across my chest - need to buy a bigger size if it works?

Also where do you get good nursing bras? I got some from amazon and a plastic piece has popped out of the side and stabs me under my arm-