I have used Cover and Aviate but could not stay with either and am back to Nova (which offer static screen of apps).
One problem I faced with both Cover and Aviate is that dynamic updation of display (which is their USP) actually interferes with usability.
Contexual dynamically generated information is good for things like Facebook/Twitter/LinkedIn streams but it does not work well on mobile phones.
People visit social network with expectation of seeing something new, they don’t turn on the screen of their smart phones to see something new but they always have an app in mind, it could be yelp (for local) or Google Maps for turn-by-turn navigation. When screen changes itself dynamically, it causes a cognitive overload to decipher the new set of icons since the spatial positions have changed.