Takedowns on enemies grant permanent Attack Speed.
+9% Attack Speed
+6 AD or 10 AP
+5 Armor or 6 MR (match-up)
Phase Rush on Quinn allows you to stick to your target for repeated follow-up damage and kill secure.
Manaflow Band is huge for Quinn, empowering your ability to poke and keep sustained harass damage up.
Celerity massively empowers Quinn's strongest attribute; Her ability to traverse the maps for roam kills.
Gathering Storm allows you to scale into the late game where you might otherwise be quite weak.
Quinn is naturally a squishy top lane that relies on her ability to burst down a target. The big heal from Triumph after kill an enemy can be the difference between a 1 for 1 trade and getting out with the kill alive.
The bonus Attack Sped from Alacrity is huge for allows you to deal consistant damage in teamfights where you have a front-line or need to shred down a tanky target.