I'm not really the person to do, like, a YouTube review. As I mentioned, I received delivery for an SR order yesterday, but Tesla just gave me an SR+ and said they would software limit it soon.
I too test drove the performance model, I think. It was one of the longer range versions, but I can't speak in-depth to the performance of that car since the test drive was basically a conservative lap around the block, with limited highway driving primarily to test the onramp pull and to experience autopilot.
I can confirm that the look and feel of the SR interior is better than I expected, given the prior expectations of cloth seats and manual adjustments. The synthetic Tesla uses is unusually comfortable and seems easy to maintain. The maps are really elegant even without satellite graphics and work well with voice commands. It might be a little disappointing if software-limiting removes all traffic awareness from maps, but I do not understand exactly what is going to change there. The cell phone docks are a nice touch.
So basically the SR interior is the same look and feel as that of the premium Model 3 I test drove except that the maps do not use satellite images which mirror the real world; they use simplified but still elegant graphics. The heavy feel of the car, partially due to the battery weight, and partially due to the agressive regenerative breaking, that I remember from the premium test drive is also present on the SR. This weight is a blessing on curves but in a straight line it somehow feels as though the car is pulling against resistance, even at speed. The acceleration is noneless satisfying, maybe more satisfying because of this curious feeling of resistance. Anyway, the regenerative breaking is a setting that can be reduced, although I haven't tried changing from the default. I would not be surprised if Tesla limits the SR acceleration slightly from the SR+.
The most concrete loss to explain with the SR is that the seat heaters, which are quite nice, will be disabled. That's a bummer, but it's a loss I can live with. There's no comparing the SR in my mind to it's ICE or EV price competitors. So I hope the target audiences for those cars flock to the SR. If I had a higher budget, I would be looking at a used Model S, and if I had a lower one, I would be looking at a used Chevy Volt or Nissan LEAF, but that's just me. On the other hand, I do think the SR+ with autopilot for $40K is the best option for now for those who want autopilot for practical reasons such as a long commute.
BTW used Model S are around this price, but 2015/6 AP1