I can't even remember how many different types of sippy cups we've had in our house. One of the brands that continues to be a favorite (outside of Playtex of course) is the Gerber. One of the favorites for the kids were the Fun Grips Color Change Spill Proof Cups. Gerber cups in general have some of the best spill proof cups I've had. The lids sport a hard plastic stopper valve, which seems to work pretty well. Two issues I've had with those is they can be difficult to clean around the membrane valve and occasionally the stopper will fall out if slammed on the floor. As for the Fun Grips Cup itself, it has a fun shape that looks like an hour-glass. This allows for more volume, and the ability for little hands to still grip the cup easily. The plastic cup is also ribbed to add a little texture to the grip as well. If that wasn't fun enough though, the cup changes color. The one we had was blue and changed to purple a cold liquid is poured into it. Once the color is changed, the cup also responds to the heat of the hands. My kids always enjoyed seeing their hand prints on the cup. I rarely had an issue with the Gerber Fun Grips cup having spills. Only when the cup got tossed (which we all know happens with toddlers) did it have a major problem.