I recently purchased the Softronic software for my 30,000-mile old 2006 Cayman S during Softronic's awesome winter special. I did no objective testing, this is all seat-of-the-pants subjective impressions.
I am very happy with the software. I would do it again without hesitation. Faster, smoother, more responsive, what I would've expected Porsche to deliver from the beginning.
A little about me first:
I live at 6,100 feet elevation, we only get 91 octane gas here. The Cayman is my daily driver, sun, rain, snow and ice. I've owned it for two years, and 10,000 miles. I'm 40-ish years old and have spent quite a bit of time AutoXing a Honda CRX Si years ago, and have been to several AutoXs with the Cayman. I used to work for a Dynamometer company. I do most of the work on my cars and motorcycles. My last car was a '98 Audi A4 1.8t with Apr software and Miltek catback exhaust.
93-octane: Since I'm at high elevation, normally-aspirated cars can usually get away with much more timing. I chose the 93 octane software, rather than the 91.
Sport mode: Turn sport mode on permanently. I don't have Sport Chrono.
Left-foot-braking fix: Keeps the ECU from killing throttle if it sees the brake is applied.
Performance: I didn't expect much here. Certainly nothing like what I would expect on a turbo car where the boost can be turned up considerably. However, I was surprised to notice that the car accelerates a bit faster. If all the software did for me was increase the power and torque, I probably wouldn't have spent the money. Fortunately, it does more...
Driveability: This is where the software shines. Combined with the Sport mode, I have found shifting and rev-matching to be much better. I really like the lower intrusion level of the PSM with sport mode. Around town it is perfect. It allows a little more wheel spin out of corners. It even works better in loose gravel (my uphill driveway) and in snow. I haven't been to an AutoX yet, but I would probably still turn PSM off for that type of event. The software has really smoothed out most of the changes that the computer and mechanicals make when adjusting intake cam-phase, switching cam lobes and changing the intake manifold volume. Reving the car from 2,000 to 7,000 rpm is much smoother with constant throttle. It also pulls a little harder right around redline since the software removes the soft rev limiter. I haven't hit the hard one yet, and generally try to avoid reving past 7,000 rpm.
Installation: Following directions, it was easy to install (with a battery charger, not maintainer). Make sure you include all the requested information when you read the stock software and submit it. Scott returned the tuned software very rapidly.
Problems: None. No pinging, at least in the winter.