User blog comment:Alartan/Cooldown reduction is love, cooldown reduction is life!/@comment-3466579-20150302162927/@comment-8379657-20150302224905

40% CDR means an ability can be used ~66,7% more often than with no CDR, not 40% more.

Although I agree that CDR isn't as good as OP makes it out to be, it is pretty good on most champs. Especially those without mana or energy of course.