User blog comment:Supp0rt4n00bz/Some Champs need a nerf!/@comment-5453544-20130521081928/@comment-4717259-20130521144509

Zac already has pretty good clear times together with his all AOE kit, and E helps that too, by mid game an E destroys a wolf camp almost alone. The range DRAMATICALLY increases when you max E, allowing for some unexpected and amazing ganks from angles you couldn't gank as other junglers. Also it's cooldown decreases quite a bit, 100% lower when compared lv1 to lv5. Also helps your initiation, getting on the team faster and increases burst damage, as it's the spell that has the most base damage.

Also, W's power should increase per level. Or, if you're planning not to leave the jungle and just farm the entire early game, feel free to max W, but it won't increase your ganking power  much and it's a DPS tool, ganking favors burst, which E does. Also putting points in Q wouldn't be a perfect idea, as the slow increases by 5% each rank, which is absolutely not worth it, and it won't increase clear times that much.

I currently max E by level 9, then usually max Q and W at the same time.