i like your build i have been running a very similar one in fact after reading your post im changing it up a bit to get boot of mobility instead of lucidity. i run a hardcore cooldown build so i just change some runes and masteries to make up for the boots
ill post my build soon

I agree with you that earlier attack speed is another option for this build, However in the games I've played with her, I've had more circumstances where boots of mobility have provided another form of escape/set up that was 2 good to pass up.
Boots of mobility give me the +5 movement speed when im moving to another lane to quickly set up an Ult Gank and be back to my lane before an MiA call was even made. The Mobility boots also give you almost another form of ghost, for instance, while you have the +5 movement speed you dont lose it until either you are damaged or you damage an enemy. This means I can poke before team fights, and if someone attempts to close the gap, I can kite them without damaging them for the few seconds I need to get my movement speed back up to +5, and from there, short of them blowing ghost, they wont catch me =)

Sorry for all that text!

On another note, if they have a team that can be kited very easily as a whole, I could see going berserker's greaves to give an added advantage early.

Thanks for the vote, much appreciated =)

i should say u have to get a litle attackspeed earlier then end game and why no berserker graves( this is fixing the attackspeed problem )? These were the only things i didn't understand in ur build so +1 for me ^,^

Haha I agree, the title was mostly for my friends who argue to no end that just because shes not a hard carry that she's useless =)

Caitlyn has always been extremely viable though.. >_>

Yee for downvotes with no comment