ATI Driver up and running

Following the instruction I found here, I was able to switch to the (supposedly faster) ATI driver for my video card. The output of fglrxinfo reads:

OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: FireMV 2400 PCI DDR Generic
OpenGL version string: 1.3.5010 (X4.3.0-8.12.10)

Isn't that nice? But there's one question I keep asking myself: Who needs it?