Source: Was burned by ATI, Matrox, 3dlabs before finallly coughing up the cash for Nvidia.
nvidia being the only viable solution for 3d on linux is a bit of an exaggeration imo (source: i did it for 5 years), but that was a long time ago: we have amdgpu, which is far superior to nvidia’s closed source driver.
The MGA Millennium had unprecedented image quality, and its RAMDAC was in a league of its own. The G200 had the best 3D image quality when it was released, but it was really slow and somewhat buggy outside of Direct3D where it shined. However, even with my significant discount and my fanboyism, when the G400 was released, I defected to NVIDIA since its relative performance was abysmal.