This build is ridiculous.

Yes, the W isn't as useful, mainly because if you're jungling you don't need lane clear (duh). It's only good in jungle to heal some hp back and do dmg, and while chasing to slow and do some dmg. Evolving last is the best way to go (I personally don't like evolving my R). The idea is to evolve Q for massive damage and then evolve E for longer jumps and also because the skill resets after an assist or kill, so you can chase multiple targets.

I love this build, I use it everyday. I would only replace the Magic Resist glyphs for Cooldown and have full Penetration on marks and quintessences.

This guy is talking rubbish. Since the nerd, kha has become far more of an assassin. Because of this, void spike is not as useful as it used to be, and in terms of utility, it's function is as more of a slow. To this affect, if you feel you want to evolve spikes, them do it last, but I personally value evolving hi sultry more as it gives you three stealth sand longer chase/escape potential.
A really unfair down vote to be honest, as this guy is clearly misinformed...

I think, overall. This is a good guide. The one thing that I think you miss out is how mana hungry kha is. Moreover, I think he benefits more from spirit of the elder lizard, opposed to wriggles. Personally, I think wriggles is over rated, but that is my opinion.
I don't think this guide really explains counter jungling in a sufficient way, as the most important things with counter jungling are map awareness (which you briefly touched on) but that also includes effective warding, which a lot of people miss out! Also, timing. Timing is the most important thing in jungling all together really... For example, if you are up against a lee sin, you can assume that they are starting red. Then you can assume that the clear time would mean that they had finished red off at approximately 2:10. This means, in 5 minutes, if through map awareness, it is viable, you can go steal their red...
Another issue I had, albeit a minor one, was where you said for people to jump walls to speed up clear time. The only reason I don't agree is because this consumes a lot of mana and the cd on jump is fairly high. This means that if you waste jump to dive on wolves, it could greatly reduce the effectiveness of any gank on mid that you may need to do unexpectedly. Though to be honest, the main issue with this is mana consumption. (Obviously irrelevant if you don't give blue to your mid).
Lastly, I feel your build is overly defensive for a kha'zix build. I say this mainly because kha is a bully jungler, so by taking away his damage, you are making him quite useless. Stacking armour pen and cd reduction are pretty standard for kha, so black cleaver and last whisper are fairly mandatory. (However, I tend to rush brutaliser and then build into black clever late game if necessary).
One of the main reasons to pick kha'zix is for his potential to snowball, so I felt this build almost makes him less of a presence in a team comp, if you wanted to build tanks, kha isn't the champ to do that, you are better picking someone like nautilus or malphite.
However, all that being said, it would definitely help a new kha player, but maybe a bit strange to a more seasoned kha'zix player.

Nice guide :)

Interesting summoner spell picks. I just can't get over not taking flash. Can work for interesting combo's with the leap.

I don't think you should evolve the spikes second. you should get the jump second for better ganks and to escape/close gaps better. Also i dont think blade of the ruined king is very useful because Kha'zix does not need attack speed. Other than that, great guide!

I read through the guide. It seems well done. I must however disagree with not evolving void spikes in game. Instead I would evolve everything except my ult, void assault. I would start by evolving my void spikes, then at level 11 I would evolve leap, and finally ending with evolving taste their fear. Although, what you evolve depends on your play style, this is just another way to play Kha'Zix.

Top I would say Q would be better. For jungling, I would still say Q.

The main reason is so you can counter jungle extremely well. Your 1v1 damage will skyrocket with your Q evolved early. If you don't plan on counter jungling at all (you should, but if not) you can choose to evolve Void Spike first for the ganks.

I have a question on what spells to evolve first? I usually play Kha'Zix top and i would level the Q first, but would W be better for junglng?

nice guid a tip for the die-hard jungel players, try to build ka-zix a lot more as an AD then you will rock some balls off! (ps) if you do that your play style needs more as an scavenger ore a predetore!

+1 greatzz

If you're going to jungle with Kha'Zix, you should get your Taste Their Fear at level one because of the changes they've made to the jungle. Now the small creeps are much weaker, in fact it only takes two or three attack to kill them, so you can isolate the main creep much faster now. and because of the short cooldown on your Q, you can do a lot more DPS to the camp and clear much faster. waiting until level 3 to get your Q will significantly slow your jungle speed down.

EDIT: that said, it does not mean you should max Q. W definitely. you should also not evolve Q.