I used them and they worked pretty good for My Babygirl and Me. They're not that big and the nipple is easier for Baby to use also didn't give any colics.
Everything we use is Nuk with both of our kids. Bottles, Pacis, Sippys. I tried the Aviant bottle once and just didn't like it.
I used medela for both boys loved it since I breast fed no tummy issues.