Dr. Brown's Sippy Cup Baby Bottle Review

I used Dr. Brown's bottles from day 1 with my son.  So naturally when it came time to introduce a sippy, I went for another Dr. Brown's product.  And I am sad to say that the Dr. Brown's sippy cup let me down.  It leaked ALL the time.  I just don't understand why.  Every time my son would lift it to use it, it would leak out of the sides.  The few times I traveled with it in my purse and it tipped over, I got juice/water/formula all over the bottom of my baby bag.  I thought it was maybe the beginner level cup that I had so I moved up and I had the same problem.  My son spent more time tipping it over and pouring the contents out "for fun" than actually drinking from it.  The one thing I did like was the handles that were removable as the child gets older.  But for us, the handles just made it easier for him to shake the contents out and laugh.  I gave it a fair try but just couldn't keep chasing after A and cleaning up the mess and leaks that this bottle left behind. :(