Voted for "It was fine after I tweaked it a bit."
My Gigabyte 6600GT AGP is pretty nice, and definetly a huge boost over my FX5900XT
Those FX cards really were crap in comparison, but Nvidia got it right this time
Only issues I had were driver related. The det 6x.xx drivers caused crashes in UT2k4, so I upgraded to 71.80 and that caused image corruption in Halo. But now I'm using 71.25 and everything seems to be behaving itself. Only thing I noticed is a slight studder in UT2k4 once in awhile when playing online, and I'm still troubleshooting that. I've seen it before though, and I'm confident I'll figure out what's causing it again.
Overall I'd say I'm pretty happy, but not extremely happy. Once I get all the kinks out though, it'll be perfect. Performance wise this card is a winner