WDYT? 2.1.2 was released to fix concurrency issues. Although my code base (Nakamura) cant easily upgrade because we added some desperate (and ugly) patches, I think it would be a big benefit to Sling and others who have deny permissions in their repository and either highly concurrent reads or concurrent writes.
This should obviously wait till the JCR Access Managers are released, as there could be an impact there. Ian
