lol no i haven't used it, a long time ago i tried jailbreaking my iPod touch and it screwed a lot of things up, i went over instructions many many times and i did everything correct. Maybe they've improved the process by now but i'm satisfied with they way iOS is enough to not jailbreak my phone.
anyways it is really interesting. i didn't know it included app switching too from left to right.
The only thing i could see about that that would make it better is that when you switch to using two fingers you can swipe from any point in the screen and not have to use the edge.
True, but consider one handed usage. Multi finger gestures are OK on the iPad because because it's designed to be used with both hands, iPhone however, a user must be able to operate with one hand.
With Zephyr, you can just "thumb up" from the edge and it opens.
Trust me Alpha, jailbreak your device or get it jailbroken, try Zephyr, you'll love it! I'm not big on tweaks and stuff, the only reason I jailbreak is Zephyr and Navigate from Maps, Zephyr alone is worth jailbreaking though.