For me the GTN interior works really well. The carbon fibre dash and piano black woodwork go really well, especially with the standard Moto-Lita wheel. In addition, the black leather is actually perforated rather than quilted, a bit like Mercedes do but IMO much better looking. The only adverse comment I've ever had is that some people don't like the black wheels and I've seen some owners change back to silver.
In terms of performance differential to the Series I you would note the firmer ride (but it's not unpleasant), flatter and therefore faster cornering and even more torque for powering away. Plus the noise from the side-exhausts is bliss! <img src="/forums/images/graemlins/wink.gif" alt="" />
