Should I get Luden's Echo on Katarina?

After boots (my first buy) I go for Luden's Echo. However, is it worth rushing Luden's Echo on Kat at all? Looking at the most updated pro-guide on Kat ( ) I noticed the lack of Luden's on there, which brings me to this question. My current (Katarina) item set: Core: Sorcerer's SHoes > Luden's Echo > Hextech Gunblade Offensive: Zhonya's Hourglass > Rabadon's Deathcap > Void Staff > Abyssal Scepter Defensive: Guardian Angel > Banshee's Veil > Rylai's Crystal Scepter > Lich Bane

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