I use these bottles with my son. He took easily to them and rarely spits up. They are a little more expensive than other brands, but you can always get free ones at babies R us with coupon. Just keep your eye out for the coupon in the circular or on the website.
I honestly dont see anything special about these bottles. My son was using Avent bottles and because he spits up a lot, his pediatrician suggested these bottles. We bought a six pack and tried them. We did not notice any difference. These bottles are expensive and I have no intention of purchasing more.
Great bottles my baby loves them