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Pro Google Now support
KK Launcher supports Google Now by swiping left in the launcher.
KK Launcher supports thousands of icon packs as well as popular themes from many different popular launchers. This allows the user to customize the look of the launcher to their preference.
Con Adware upon install
KK Launcher has multiple adware apps that are built into the launcher upon install, taking up precious memory as well as maybe doing other more nefarious things.