Greetings,
There are about 5 GTI's and 1 S3 at my DZ. Those of us that fly the GTI's are able to chase each other around ( fly dirty ) and still maintain some kind of a flight characteristic. The guy with the S3 kicks our asses when he is in full flight mode, however when he shuts down, he starts ( in his words ) to get unstable. Tough choice if your buddies all have GTI"s