User blog comment:Lykrast/Pick Champions, pick 5 spells/@comment-5686533-20130515071522

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With you have a 1 / 0.5 stun every 3  (1.5 seconds) that will cost  mana.

With you have a 1.75 stun every 5  (2.5 seconds) that will cost  mana, however.

It's you to choose : a frequent ministun with a 0.5 / 1 second downtime or a frequent stun that cost twice as much with a 0.75 second down time.