Spent the day driving a friend's SRS on some amazing roads. I own a 4RS.

The car is downright fabulous. To address what some have touched on:

Stiffness: It's definitely softer and more compliant than the 4RS. It was immediately apparent and noticeable. It also felt to me like it had softer bars front/rear as well as it was not as flat as the 4RS. The PSM is also actually usable on the SRS vs. the 4RS. It goes from very compliant to firmer with a quicker transitional set. This was pleasantly surprising. I also get the feeling that there is a hair of chassis flex in the car and/or maybe why they softened it up.

Loudness: the numbers don't tell the story here. I hit a max of 108db on the meter which is more or less the same as my 4RS. With the lack of the echo chamber that is the roof/windows, it seemed much quieter though and not as harsh in the mid range to my ears. I know this is not a solid state amp but still I never once got volume fatigue in the several hours of driving the car.

Usability: I think i narrowly give this to the 4RS because despite being stiffer and louder than the SRS, the SRS has the silly top that is a less then user friendly. It also has a speed limit when the top is up lol.

I honestly loved this car way more than I expected but that is due to largely the same formula as the 4RS but toned down to make it a fantastic street car with a maniacal character. Those that have it on order; congrats!