These cups are great.  Over three children, I've tried many, many different brands of cups.  These are by far the best.  They don't leak (a lot of other "no leak" cups do).  My 13 month old carries it around, throws it down, shakes it....and nothing.  I saw another review that said if you don't insert the piece properly, it will leak.....but any cup is going to be like that.  If you don't put it together right, it won't work.  It just takes a minute to push the white piece in, and then you're mess free!  We had some friends come over with their first little one a couple weeks ago.  They...