We've been able to make the clients make better decisions in our controller environments, so the new feature is only minimally interesting to me there.
In our virtual-controller environments however, we've have trouble with our clients to a much greater degree.
Yesterday we cut from our outgoing gear (4 half-power, non-WIFI Alliance "controller" based APs) to 12 iAP 104/105 at one store and have "much worse" coverage as our personnel put it.
The bar-code scanning guns latch on to the first iAP they see and can still see it just well enough that they aren't roaming as they move through the store.
We're trying to figure out how to make them roam sooner, but it would be nifty if the iAP cluster would help us.