Collection-repeat and one-time binding

Is there a real benefit in term of performance to mix one-time binding of Angular 1.3 when using a collection-repeat?
May you confirm that all watches associated to previous or upcoming items are detached while scrolling?

Is it known as a good practice in Beta 14?

It would force me to mix collection-repeat with this kind of directive:
in order to trigger some updates to the list manually.
For example, when a user changes the price on an item, I expect a pull-to-refresh to update it.

Is there any way to use both collection-repeat and one-time binding? If I try to use both and load new data using ion-infinite-scroll, my items will be the same (nothing change).