I love, LOVE, L-O-V-E this mascara. I have tried VERY high end mascara, and drugstore brands I ALWAYS end up come back to this brand. It defines & lengthens without clumping or looking "fake". In my humble opinion NOTHING else compares.
Definicils by Lancôme is definitely my favorite mascara. I have been using it for years, and have not found comparable one that can extend and separate as well. I use other ones only to thicken or extend further for the evening. Otherwise I may still use definicils as a starter to angle my lashes just right first.