User blog comment:TNickxx/Slyph, the Swift Striker/@comment-1618239-20120423195432

In a fight with 5 enemy champions, he gains 40 MS, bringing him to 350 base MS. That seems like a lot when other champions have 330 as a max, including Vayne, and that's everything that her passive gives. (On the other hand, she has a nice kit. You do have to look at the champion as a whole. Still think this should be chewed on for a bit.)