The machines _have_ improved a LOT. I've had two* bouts of breast cancer, both caught quite early because of regular mammograms. Treatment wasn't pleasant but it was straightforward, it worked, and my docs and I aren't worried about it coming back. *Different kinds, 1 L, 1 R. Not a metastasis
By the time I could have felt the tumors they'd have been a lot bigger & a lot harder to treat. It's not 100% but it worked for me. NB I have dense, cystic breast tissue. I needed ultrasound follow up. Even easier than the mammograms. Cold goo, it sometimes tickles, it's a bit sticky. No biggie.