User blog comment:Alartan/Swiftness or Mobility boots?/@comment-5266525-20150201191955/@comment-4091261-20150202184352

While you are right about that Shaw, it is a bit risky to rely on the hope that someone, even a minion, won't hit you as you are walking up to them. While it is nice that you could save an ability for engaging, that isn't a "small bit" of extra in-combat movement speed when taking into account the slow resistance. Cutting away 25% of a slow is a pretty big deal because of base movement speed being such a high number. Imagine how painful it would be to get hit with a slow with. Yikes!

Anyways, I believe are good for in-and-out champions. Champions that jump in, do their little burst, then get the heck out. Reason I think it is more appropriate here is because usually these kinds of champions are able to sustain a fight, they don't really need to escape, but they just prefer to do throw their combo and be on their way. What makes it good for these kinds of champions is that the final chase is a lot easier with the extra out-of-combat movement speed.