Phantom Dancer on Wu?

So, in a recent game, I noticed that despite Cleaver, Ghostblade, Swifties, Fizz on the enemy team remained faster than me. So, I thought to myself, what item can I buy to increase my MS over him without sacrificing offense.

There's Deadman's, but I vehemently despise building armor on Wu. I considered Duskblade, but I thought to try something a little different...I went Phantom Dancer and boy it sure melts that fish down right quick!

Wait, crit chance and attack speed on Wu? Am I insane? Maybe I am. But then again, his E and Q do benefit from AS because their effects are timed and when you've nothing left but AA's, you may as well make the most of them.

Then you have the beautiful synergy that is the Lament of PD with Wu's passive. Damage reduction without having to build tank. Yea, it's nice.

Then there's the movement speed that not only increases when near visible enemies, but grants beautiful, beautiful unit collision immunity.

So, any thoughts on this?