I always wonder how a short test drive on busy crappy roads with a sales person in the passenger seat can tell you anything about the car.. I buy cars without a test drive. Enough research like forums, car mags, Chris Harris reviews, etc etc will tell a prospective buyer a lot more, IMO.
I never drove a GT3, but I am sure this would be the best car for me... Just like M3, the car was everything I expected and then some