Happy to have received this as a free sample to try out before buying myself! The nipple is nice and soft for breast-fed baby. They flattened easily in my baby's mouth mimicking my nipple and was easy for her to go back and forth between my breast and this nipple.
Unfortunately, I had a hard time cleaning the nipple. The grooves near the hole trapped soap bubbles that were hard to remove even with the nipple end of my bottle brush. I can see how the grooves help milk flow to the baby's mouth, but I'm concerned that soap may be getting stuck in there.
Overall, these nipples are good. They have a nice sturdy feel and are BPA free. I may try to find ones that don't have those grooves in the top though!
In return for my review, I was given the above mentioned product for free. The impressions stated are 100% my own.