Title: I have 11 of these and 6 leak...
Product review: I purchased a total of 11 of these cups over the past 5 months. For the initial use, I did have to push a tooth pick through the slits on the valves. They all worked fine for a while, but have started to leak from the top vent hole (not the spout). I am soooo frustrated! I thought it was the perfect cup and never would have invested that much money in a whole set of them. I can't stand having a million different types of cups. It makes matching them up too difficult. So, I guess I am going to have to switch to another brand. :( i can't handle the leaks.
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