This is an awesome mascara! I had tried the thickening before with good results, so I thought I would try the lengthening formula. They both have the same brush and to me they have the exact same formula, but the lengthening is a little more wet, making it easier to work with. It doesn't clump and goes on smoothly. Great for an everyday, natural look. Plus it's only $1.99 (I've seen it cheaper at other places!)It is also buildable! Great stuff!!!