I have a regular old ground glass on one of my Rolleis, and I find it quite good in bright to normal light, I think in large part because the mirror has been cleaned if not replaced. The view is quite grainy so the focus snaps into place. I think that the mirror can get quite dirty over the years, so it might need to be cleaned even if you replace your screen to get the best results.
Otherwise, I don't see how you could go wrong with the screen from the seller in the link you provided, as the feedback is large and overwhelmingly positive, but I can't comment on that particular screen.
I have one in a camera that looks similar, with the split image in the center. Mine is brighter than the plain ground glass, particularly in the corners. I just use the overall screen to focus, as the split image on mine is not much additional help.
I have seen bright screens that were very bright but actual focus was vague. The Maxwell screens are marvelous, because they are bright and also snap into focus, but a substantial investment.