The leaky RMS caused by installing the RMS backwards to reduce drag & add 1 horsepower is on the 997 GT3 I am not sure which years, but is not a factor in the 996 GT3. The only negatives I hear on the 996 GT3 are: stiff ride, no PSM & prone to oversteer so I would think coming from a older 911 you would not notice any drawbacks.
