I had received one of these as part of my baby shower present half a year ago and after using it, thought it did what it was supposed to do. I ended up purchasing two last month, as they were relatively cheaper than the Dr. Brown’s ones. The ones that I was sent were awful in quality and quite frankly, unsafe for use. The brush head broke after using it twice and I was sent a replacement. The remaining ones started to RUST and the coating disintegrated right where it loops around the sponge after just a few uses. Can you imagine unknowingly ingesting the plastic and rust? The bristles are quite rough, so if you are cleaning plastic bottles, it will definitely leave scratches.