I'll try to make a little comparison to the 996 Turbo:
the GT2 feels lighter, the clutch works harder (no wonder, it has no hydraulic support) and the gearbox is driver heaven, shifting is much more of a pleasure compared to the Turbo because of a shorter gearing way and a more stiff and precise shifting feeling. Almost like on a real race car.
The steering feels almost the same as on the Turbo but steering-in seems to be more precise with a narrower margined feeling at higher speeds and the typical "nervous" feeling of race cars.
The brakes didn't impress me, the GT2 I testdrove had the PCCB. Not worse that the 996 Turbo brake but I can't see any improvement over the 996 Turbo brake and it doesn't seem to justify the higher price for PCCB.
The suspension on the GT2 feels stiff but not too stiff. Compared to the 996 Turbo, the GT2 is more difficult to drive fast because of the missing 4WD and PSM. The limited slip differential on the GT2 works pretty well but it doesn't save you from excessive cornering speeds or other driving mistakes. A pro driver will be always faster in a GT2 but a semi-pro or just "standard" Turbo driver will never be in a GT2 as fast as in a Turbo because the GT2 comes pretty fast with the rear part if you're not careful. From the factory, the GT2 has a mild understeer setup but most GT2 owners adjust the suspension setup to their needs and sometimes to their disadvantage. Porsche doesn't sell the GT2 with a "moderate" suspension setup without a reason: to protect medium talented drivers from themselves.
The only thing I really don't like about the GT2 is it's price tag and maybe it's weight.
The brake is another story, it isn't really bad, it actually is a pretty perfoming brake but I don't see any PCCB advantage, thus not justifiying the price tag of PCCB.
Last but not least the question if the GT2 is the perfect track car: from my opinion, it is not. You have to do a lot of mods and the brake isn't quite track proof as many GT2 owners reported. But compared to other sportscars, the GT2 has at least the racing genes and with some mods and a good setup, the GT2 can be the right track car.
If you want a GT2 mainly for street driving, I don't know if I could recommend it without hesitation. The 4WD and PSM of the Turbo are pretty nice features to have for everyday driving and more power on the Turbo is an easy (but not cheap) job.
Another thing: if you want to upgrade the power on a GT2, it is easily possible but the missing 4WD/PSM make it much harder to drive a tuned GT2.
I hope I could help a bit and I'm sure that Luigi can give you a better description of GT2 driving.
