I'm with you... we used Avent for DS and HATED them... I cried when I lost a large amount of breastmilk I had pumped due to their leaking like a sieve. I don't care what people said, I looked at online tutorials, you name it, for help, and nothing worked. It was always hit or miss.
Anyway, I polled my friends with kids, and the vote came back for Playtex drop-ins for ease-of-use, working well with breasfed babies, and no leaking at all. So that's what we're using this time around!