Love it :). I do better with this one than other AP guides.

After playing a few more games, highlander seems to only proc off of melee last hits versus getting a kill with alpha strike. Riot probably did this assuming Yi would never be built ap

I really like this build, and I can't wait to try it. It seems very well thought out and thorough. BTW, are you sure Highlander kills don't refresh cooldowns? I know there's sometimes a short delay, but I've never been deprived of the cooldown refresh. Anyway, good build +1

I'd say just pick Exhaust or Ignite but not both. You basically NEED flash. The runes are a real big problem to me (you get AD from Yis E) read Searz' rune guide I strongly recommend it.

I suggested tank items because if meditate is broken then you're dead ESPECIALLY without flash

The summoner spells are more or less just preference as i tend to be fairly aggresive when i want to get a kill sometimes. Flash can be very effective also. The runes are more or less just what was in my runebook, and i was suprised by how much the extra AD helped when im trying to farm last hits early on. later their not as noticable, but i like to play a strong earlygame. Ill add in the cooldown reduction runes, the flat ap is just what i had and i liked them. The spirit visage is a good idea. I add in some things. Thanks for the advice.

Change spells to Flash/Ignite imo, runes to flat CDR glyphs (approach 40% cdr), AP Quints, MP marks (Why do you have AD?) and Armour Seals (Why do you have ap seals?).
Don't suggest Clarity it's useless. Need a Veil in there (So you can meditate without being broken or even a Spirit Visage instead of Morello's tomb)

Other then these points it's a well written guide just got some problems.

well ive seen it be used

:)

Relatively decent guide for AP yi, setting aside stuff like thinking AP yi sucks because he only HAVE one skill to damage, you have done relatively good :)

Most Yi don't take Lich bane, which is totally good for him if he is played as AP.

You may also want to add in a siutational actions that you may want to take if you play Yi, along with the part you said about siutational items :) By situational actions, I meant something like Meditating in front of opponent tower when in need to heal etc :)