I am woefully, woefully, WOEFULLY ignorant of the Sarum Rite. I plainly do not know much about its particulars
Fr. Chadwick has a concise page on the Sarum Rite, which can introduce one to the Rite and the contemporary discussion around it.
I am somewhat versed in discussion itself. Bernard Brandt has a recent entry in the conversation well worth reading. The article comes as the discussion from a Roman Catholic perspective, or, at the very least, the perspective of liturgical law in the Roman Church.
My own reflection on the discussion around the Sarum Rite - ill informed as it is since I have little chance to study the rite - is that the Sarum liturgy is an unfortunate victim of the Reformation-Counter Reformation cycle. Too condemnatory of the liturgical reforms undertaken in England amid the Reformation, and too flagrantly independent of the "Roman identity" that developed as a response.
In both instances, it successfully reminds contemporary ecclesiastical interests that Catholicism existed before the Reformation-Counter Reformation dialectic, unfettered by either Anglican or Roman identity crisis.
Hopefully the discussion around the Sarum Rite/Use continuous. It will aid in the rediscovery of the Latin liturgical tradition and, perhaps, help identify the hallmarks of pre-Reformation Catholicism and the subsequent discontinuities.