I've heard nothing but good things. They are really supposed to draw out the image on the screen, and make the picture much more realistic. I think it's worth it, but I'd only get it if I could get them at my local shop (which I can't - oh well....)
XP 2500+ Barton @ 2241Mhz
A7N8X Dlx
2x512MB Corsair PC3200
MSI GF3Ti 500
16x DVD-ROM
2x80GB 7200RPM Maxtor
Onboard audio