I do not aprove catalyist

I always prefer ignite(Make a note if you use heal then dont take the one point in the offensive tree).

I prefer going AD Quints since you get a trinity force for extra ms+E escape. I always prefer phage before Sheen because the slow is great for chasing kills/escaping/extra harras.

Getting a cata is very bad because you won't be able to trade effectively with the other ADC. The phage also gives you life so you don't need it so early.

Bezerk greaves are better than merc treads because if you are caught that little tenacity reduction won't keep you alive because as a ADC you are squishy.

Also note you won't always want a banshees veil, sometimes a QSS would be better for instance if you are versueing mordakaiser or a GA if you have some good peelers/VERY late game or are just very fed.

Make your guide more descriptive. Correct some grammar errors. Add more BBcodes and pics. Explain your spells and things more. Other than that, it is a pretty good guide.