kumar,
I know exactly what you are saying. I took Apollo's car for a quick drive after the initial install and there's a definite first gear chatter. A little higher RPM at take off seems to mitigate this. Also, as Terry has been driving it a lot - I think two things have happened. First, it is likely a little better than it was initially and second, I think that Terry has changed his driving style to mitigate this effect. I am reminded all over because we just put the same clutch in Chip's car and I drove it for the first time this afternoon and it is pretty much identical to Terry's. Overall, however, I REALLY like the clutch. Obviously, it's handling the power that we're throwing at it really fine and I really like it's firm, on/off behavior. My recommendation would be to give it a little more time - and admittedly your technique will have to change a little bit with this clutch. Overall, I would recommend this clutch over any others that may be available for the GT.
One last note.... make sure your clutch is bled real well. They are really a bitch to bleed correctly and do require that BOTH bleed ports be used in the process. At least this is our experience.