Your PIEs are low for MCC 03RG20, at least from what I’ve seen from recent batches coming from Taiwan (MAP6/MAP7), and this is at 12x. I’ve done 8x scans on CMC MAP6/7 media and have around 200,000-350,000 total - this amount will probably be higher at 12x. PIFs in your scan are pretty high for this MID, and the clustering isn’t pretty. Nothing that’s too alarming though.
Probably B-grade MCC media, but still pretty decent. I tend to stay away from re-/overprints since its usually a sign of less-than-excellent media, and are inconsistent. On the other hand, if they’re a helluva lot cheaper I wouldn’t mind buying some for non-critical data/videos. And since in your case they’re free, I’d use and abuse them.