Purchased to supplement birth lot that I had for the birth of my son. I'm glad these bottles: quality, ease of maintenance (I have no dirt remaining), good grip and has spent several months that I have, and despite microwave and dishwasher, they are immaculate and writing is still there. I thought the nipple was too good to be true yet: less colic, easier to switch from breast to bottle (compared to the former collection), less hiccups and rot! No leakage and here the cap fits comfortably despite several months of use. I have recommended this product to my neighbor and my best friend; they are also delighted