So I don't have any experiences or plan to get any in regards to guide making.
I like to build champions the way I like to play them.
I played AD yi when I just started LOL, but grew bored as it was too easy to start snowballing and get 30-40 kills.

Now I've been only playing the game for a couple of months and just recently began playing ranked, with moderate success. Note that I have never take Yi to ranked games and I don't think it is a good idea, either. It is really easy to snowball Yi so any sane team in ranked will destroy you early by any means necessary, that, I have done often even if it meant me having a weak game.

So I figured, that THE most important thing for Yi is a really, strong early game. AP Yi has in my experiences THE strongest early laning potential. However AP Yi has the tendency to fall of late game, especcialy now with his W ability reduced to a 2.0 scaling, from the 4.0.
However a fed AD Yi late game has no problem slaughtering just about anything and running off with the refreshed ulti.

So I figured, I'd take early AP runes, and masteries which would impact middle-late game for a AD Yi.
The outcome was a great success with 3 consecutive out of control snowballing matches :)

I don't really care about likes, I DO HOWEVER care about comments, and constructive criticism is appreciated, and flame will earn you a *******. I wrote this because it works REALLY well for me and I would like some feedback on it.
Do me a favor and don't criticize the lay-out of the guide etc..., I am incapable of caring for things of this sort.

Thank you for reading :)

Please look at other AD Yi guides for mid-late game playing and other AP Yi guides for early gameplay.
I have however posted some general advice in the item notes

Ah, almost forgot YOU CAN PLAY ANY LANE!
You will own any lane , however I like solo top or mid best as it is great for your CS, and you have nice ganking potential(mid)
You are VERY likely to score a kill on bot, however if some idiot play ADC next to you, and thinks you're his support, then you will ruin his game. The enemy will only target him, as you will heal any injury and you will take all the minions, you won't be focused in fights due to your heal (op early game), and will end up taking kills, effectively shutting your ADC down.