Does Not Deliver the Goods
Opus Domini Lite does not deliver when running under OS-X Lion; there is no task integration with iCal and it is impossible to edit an event (e.g. move it to a new date/time). I guess one it expected to delete the entry and create an entire new event. There is also no option to use natural-language entry, a feature that is becoming increasinlgy common in calendar apps. I have no idea if the paid version adresses any of these problems; the lite version offers no incentive to try the upgrade. Recommend avoiding this one and look for a calendar app that fully integrates with iCal and can be linked to iOS calnedars.
exaro about
Opus Domini Lite, v1.6