I use DxO PureRAW2 in conjunction with Capture One.
I use PureRAW and then import the files back into C1 where there is a noticeable difference in the quality of the PureRAW files compared to C1 Good so far. However (and it’s a BIG however), when I export the files as jpegs, there is a horrible ‘cyan’ fringing on the output photos.
I have tried using all the different outputs available, even used DxO via the finder plugin.
Yes, I have exported the files with C1 Only (perfect Jpeg) and then with DxO (not perfect). I have even turned off the chromatic aberration setting and while it made it better, it didn’t improve it.