My Dell U2410 does a poor job of handling PAL interlaced mode. It displays visible interlaced artifacts, but it does well with a handful of other modes, namely DblPAL HIRES NO FLICKER.
From what I am reading, I should not expect the OSSC to eliminate this problem. There are other problems I have with the U2410 that I do hope it will help with but I won’t be sure until I get my hands on a unit (patiently waiting for pre-orders to open).
There may have been two or three firmware updates since this post, however, and I know improvements to interlace detection was involved so I am optimistic.