Talk:Phantom Dancer/@comment-24384176-20150204210807/@comment-26110806-20150304122444

The values are actually more around up to 140 armor with Q on, and up to 310 armor with Q off.

With the upcoming changes to Tristana's Q, where every basic will reduce the cooldown of Q by 1 second, she'll be around 2 seconds between each Q, assuming she can can attack continuously. That means Q on must weight 5/7, and Q off must weight around 2/7.

(5/7)*140+(2/7)*315=190,3

In conclusion, with the buff to Phantom Dancer, it's now worth getting it over a last whisper, with that build, if the targets have an  average of less than 190,3 armor.

Also notice that Tristana already reaches the 2.5 attack speed cap with that build and the second phantom dancer, with Q on, which already pushes the tides towards the last whisper.

Notice that if you can only get 1 basic attack off, for example with a burst combo, the last whisper is probably better, even though the phantom dancer gives a more reliable crit.

Finally, if your champion has physical damage abilities, the last whisper can quickly become a superior item.

And I know this is off topic, but with the active on, Youmuu's Ghostblade is an even better item than Phantom Dancer.