I am a Mesmer Lvl80, with a running and a fighting set in PvE.
The running set is mainly the focus, because of [Temporal Curtain].
Furthermore, I have equipped the [Signet of Inspiration], which sometimes grants me [Swiftness].
But weirdly enough, the Signet’s Swiftness cannot be prolonged with the Curtain …
It works the other way around, though …