Munchkin and Nuby have worked well for us. I was having a problem with leaks until I realized that the nipple part has to be fitting perfectly in there.
We're huge fans of the Zo-li bot sippys. They have a weighted straw so lo can drink at all angles and ours hasn't leaked at all even though it's been dropped and thrown several times already. They're a little pricey but worth it in my opinion.
Re: Another sippy cup post..
#LOLFITMAMA
We got her the green one with the fruits.
#LOLFITMAMA
I think sippy cups are hard to drink from. We've tried munchkin and playtex and I didn't care for either.
Munchkin was spill proof but also drink proof. I didn't want him learning to bite and suck for liquid since I'm still nursing.
Playtex leaks. Boo