I think he was referring to WMP9, not DX9.
I had no problemo with DX9. Also I saw no difference whatsoever. But, no game uses it yet, anyway, and if they did, they'd prolly refuse to run on my GF2, since it has no magic pixel and vertex shaders.
It's a set of drivers that run on background, so it doesn't bothers me. I only had problems with DX stuff when I installed DX8.1 in my dad's computer (windows98), and only AFTER install it said the video card drivers were not 8.1 certified, and deactivated ALL direct3D AND Directdraw support. Not even Gens would run anymore, because it would crash when trying to create a DD window.
And the M$ support page simply told me I was f*cked and could do NOTHING else other than fresh-reinstall my windows.
Thanks god I found an unofficial tool that allows you to remove DirectX.
BTW, before anyone says "why didn't you get newer drivers?". Well the card's manufacturer decided not to make 8.1 versions of their drivers.