OpenGL is in okay shape now, with the game having full support for 3D models, however...
- Lighting in software has a certain grittiness that is lost in OpenGL
- Color blending is also a bit less sophisticated, and less pleasing to the eye
- Some visual bugs with things like midtextures still.
- Some visual downgrades with things like transparent water textures and the forest treeline in CEZ1.
However.
- There is no such thing as visual bugs with FoF's or PolyObjects
- Dark areas have shapes and textures easier to make out, assuming the mapper corrected for the difference by reducing the amount of light.
- Faster for complex levels on decent GPU's.
Some of the remaining issues should be solved by a Gitlab patch that adds shaders to the mix, but I do hope it gets to the point where software just becomes a fallback.