Does Swiftwind's Haste stack with Haste from other items?

[Loadsamoney]

Since it comes from a worn effect, Swift Spirit, does it count as a separate form of Haste from items like FBSS or Runed Bolster Belt?

Basically, I'm trying to figure out if it's worth still using a Haste item in an armor slot once I get Swiftwind, or if Swiftwind overrules it and having another Haste item becomes pointless, in which case I'd want to find a replacement.