Does anyone use Stormraider's Surge?
Because seriously, I haven't seen this mastery for ages, and I don't use it myself. I've tested it and came to the conclusion that it is not a bad mastery, but there is absolutely no reason to use it over other masteries, especially Thunderlord's Decree.
The biggest problem with Stormraider's Surge is: Why would you pick this when other masteries give you more damage? Thunderlord's Decree, for example, can ensure that no squishy champion can survive your combo.
The other problem with Stormraider's Surge is that it is very conditional. Only burst heavy champions like Annie or Talon can really make use of it. Even them prefer Thunderlord's Decree, because again, more damage is almost always better.
And finally, if you want more movement speed, you can just itemize for it.

If Stormraider's Surge is not picked even in a meta where everyone is getting tons of movement speed, then there is something wrong with this mastery.
is an example where I will see it from time to time. Although it's pretty rare.