The Motorcraft 820S is made by Purolator, and there have been some issues in the past few years with the media tearing in them (the 820S seems to be a problem filter, not sure if it is just more of them cut open or if a design issue).
I would (and did) choose a Wix made ST filter over a Motorcraft 820S filter.
As said, use the free filters as planned, they will be fine.
For future purchases, if you can get the Wix for 4.92, I would use that all the time. Quality filter that is good for up to 10,000 miles.
Overall, as another member here say all the time, oil filtration is not near as important as air filtration (sorry, just can't think of who says it all the time). So long as there is no filter failure (media tears or bypass valve malfunction), most any filter will do what is needed.