It's great to know you've successfully ported the driver so quickly.
Well, I tested the new opengl driver in UT and there's a definite performance increase with my Kyro2, especially when I use the S3TC textures. I used to have a studdering problem, just like what WimpMiester talked about with his Radeon, but now it's as smooth as ever!
I think thats a pretty good reason to release the Unreal1 ported version.
My guess is that the studdering bug in the last opengl.dll version only affected radeons and kyros, and not geforces, which may explain why you don't have a performance difference.