I opted for the PP, in fact, I fully refused to consider any non-PP cars. The 3.55 final drive and the Torsion differential are the main drivers, as the 3.15 ratio on a 26.7" tire is unacceptably tall, like the factory 2.73 on a 25" tire 79-04 Mustang. With my previous cars, a gear swap was no big deal, and usually among the first order of business, but after dealing with setup hassles and bearings in S197 cars, I resolved to avoid doing gear swaps whenever possible. The suspension bits are a nice upgrade as well but are take it/leave it for me, the performance aftermarket can do a pretty good job of handling for not too much money. The larger radiator and bigger brakes are a huge secondary selling point for me, while the larger brakes do not necessarily shorten stopping distances, they will support more aggressive use through thermal management. Fitting winter tires was a concern for me but the price of my studded Pirelli's between 17 and 18" was a mere $5/tire, and I had wheels available to clear GT500 brakes, so fitment was not a problem.
Finishing up with the additional interior appointments are a nice icing on the cake. I usually do my own interior gauges on cars, but visual integration with the S197 and S550 dashboards is much harder to avoid the "tacked" on appearance of pods and pillars that are completely at home in Vintage, Fox and SN95 cars alike. Aside from the oil temp (useful) and boost (just a bobblehead) much of my datalogging will be done through OBD 2 and a smart device, so finding a permanent home for that is hardly important.
Overall the Performance Package for $3000 CDN on my car is pretty much paid for if I were to do a post purchase gear swap and Torsion alone, so I see a lot of value in the entire group of features.
