User blog comment:FairyRaven/Fairy Tail Chapter 429 & 430: Code Blue & Purification Ritual, Review and Commentary/@comment-4933386-20150420123137/@comment-5894890-20150420162022

I'd say it's to soon to judge Taurus Stardress, perhaps it could increase her strength, and/ or agility by a significant amount (Since celestial spirit mages are known to have a weaker physical side, so I guess that Stardress will make up for it.) BUT I agree, as described in my comment, my reasoning is mainly we don't see her showcasing/ doing and anything super interesting with it (So far it's more of a dress-up fashion show, than a power up).