For as long as I have been a makeup artist there has only been one mascara used by professional makeup artists, Maybelline's GreatLash mascara. I have tried so many different brands claiming to be the best and I always return to Maybelline's GreatLash. It lengthens, thickens, colors the lashes beautifully and does not dry up or get clumpy. But, as far as mascara's go, always be aware of the moment you crack open a new mascara, it has an expiration date. Throw away and rebuy every two months. This is for health purposes. The moment you open a new tube you are growing bacteria inside that will create eye infections if used over two months. One way to make sure the mascara last until the two month expiration date is to NEVER PUMP THE WAND! By pumping the wand you are pushing air into the tube and feeding the bacteria to grow faster. So always be safe than sorry, because no one looks good with a red, puss filled, irritated eye infection.
Just offering a little of my experience and knowledge.