The steering feel is at least the same or heavier, difficult to say. It is not something you are going to be annoyed with when driving slow but it definitely is much heavier than with Powersteering Plus. I drove my last 997 Turbo S over two months ago, so it is difficult to give you a precise answer. If you have a medical condition (the guy I met at my dealership had severe joint pain (arthritis?), so he ordered Powersteering Plus) or if your wife drives the car too, maybe Powersteering Plus isn't bad at all.
Regarding chassis height: No, the 991 Turbo S does not have an air suspension (similar to Cayenne or even Panamera). Ride height is always the same.
Sport Plus is almost undriveable on public roads, tried today (it was finally dry outside!!!) and the rev figure is way too high for use on public roads. I didn't rev above 5000 rpm but I didn't have the feeling that it would upshift any time soon, so... 
The engine/exhaust sound is pretty loud over 4000 rpm, so you don't want to drive that way on public roads, unless you enjoy getting the middle finger or a fist shown to you. 
Also, in Sport Plus mode, the front lip and the rear wing are deployed and while the car looks great that way, I just feel stupid driving around that way through the city. 
I had also some weird encounter today: There was smoke coming out of the left front wheel arch (and a tiny bit from the right too). I mean visible smoke, as if someone is smoking, not scary huge fire smoke. Shortly before that, I took a 100° right curve at a pretty high speed (120 kph 
), the G-Force meter showed 0.99 g (not sure if this is good, I haven't really tried hard...photo will follow). I suppose this was some vulcanization rubber which came off the new tires and since this was the first time I was actually driving on a really dry road, I think that vulcanization layer from tire production came off and it started to smoke and to smell like burned rubber. I checked the wheel arch and the wheel for anything else, also looked a little bit under the car, nothing wrong. Then I drove another 30 km or so and no more smoke, so I guess this was it. A bit scary though. I am going to let my dealer check on it next Wednesday, just to be safe but everything seems to be OK. Apparently the tires weren't really "broken in" after 400 km, probably because of the wet streets, so the vulcanization rubber layer didn't come off.
Also something interesting (and quite annoying): The tire pressure was set to comfort levels (speed limit 270 kph). I wasn't to drive 270 kph or faster before break-in but still, you don't give a customer a car with the wrong tire pressure, especially since my dealer knows that I'm always driving as fast as possible.
I also played around with the AWD and Performance displays in the speedo cluster but there are more of a gimmick. They should be available through the PCM too, to entertain the passengers but for the driver, they are quite useless. The G Force meter is however a nice feature, not really important but it saves the highest value and you don't have to activate it. Nice.
Regarding the glass roof: I actually like the contrast and I think that with lighter colors, the black roof is actually nice. If you get the black glass roof with a black car, you can't see it anymore. Seems to be a matter of personal taste, same goes to the black plastic of the side inlets and other inlets. I like them in black and would only get them in carbon but not painted in exterior color. This would look horrible. Everything one color, no thanks.
Also a word about the BOSE system: I'm afraid I regret a little bit not taking Burmester. Yes, the sound is OK but worse than I actually remember. It sounds worse than BOSE on my Cayenne GTS, which is a surprise. I guess Porsche did some tweaking to make a bigger difference but if you are an audiophile and you don't care about the extra cost, get Burmester instead. Especially if you are going to use your car as a daily driver.
I have now over 500 km on the car, oil consumption is still not visible, the level is still at max.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Cayenne GTS (958), BMW X3 35d (2013)
We didn't find anything else to do on short notice, so no birthday party on Saturday. However, my son drove with me over six hours in the car yesterday, my wife was already mad at him but he didn't want to leave. 
So I guess it was a good "party" for him after all anyway. 
