Just got Zephyr for the first time just now, seems to work great with Auxo. I have to say, Zephyr is brilliant. I was really worried I wouldn't be able to use it because some applications really need to be able to use the swipe from bottom or from the size, plus games like Fruit Ninja and Infinity Blade would be totally unusable....then I see they have individual application toggles, and they work beautifully.
I do have to say, I think it's very odd that the default app switcher delay is 0.8 seconds. That's really hard to use...the short 0.1 second delay is perfect, and frankly I can't imagine why anyone wouldn't want it that way. makes it so a slow swipe up opens the task switcher, while a flick up tosses the app. Perfect.
I have to agree that Zephyr + Auxo should BE the new iPhone multitasking paradigm...Apple should get out their pocketbooks and buy them.
I do notice one issue, though. Occasionally, if I close an app with the home button instead of tossing it away via Zephyr, I get a blank screen, and I have to open the task switcher and go to an app and then close an app again to see my springboard. It doesn't happen all the time, but it's happened a handful.