Zephyr is f'ing amazing. She's neck and neck with Loki for my third favorite frame.
Tailwind is like a non-damage dealing version of Excalibur's Super Jump and Slash Dash, but with much much more range (when you add Duration)
Turbulence shield lasts over 30 seconds (with added Duration), and while it doesn't make her quite as tanky as Rhino or Trinity, it's pretty damn good.
Tornado is a great crowd control ultimate and is sort of like multiple Vauban Vortexes that home in on enemies. This one needs some Range to go with Duration.
Dive Bomb is like a smaller Rhino Stomp that I haven't quite mastered yet. Like Tornado, it needs Range to be effective. I don't have a power build, so it isn't quite as good as Tornado for crowd control, so I mostly use it to get her back on the ground quickly. It's possible I'll forma it out for either a Focus or a Continuity to support her other abilities.
My build is currently Rage/Quick Thinking/Streamline/Fleeting (R4)/Narrow Minded/Overextended. One "D" forma allows me to put on all of these at max (other than Fleeting), and I may forma her for E Siphon, but I don't find that I have a lot of energy problems, and I kind of like her with Rejuvination.