There is plenty of storage space, even with two-four passengers. With one or zero, you can fold those rear seats down and take a visit to Costco or your local hardware mega-store and pretty much fit whatever it is you want in there (don't forget the frunk).
I was offered the chance to drive both the black P85 and the blue P85+, and I took the black one out first. James has at least two courses he uses, one of which includes a run on the loop highway around Osaka (handy, that highway!) I'm always a bit conservative starting out driving someone else's car, so I took it easy getting out of the parking garage and out on the roads of Osaka (last time I drove there was around 23 years ago). Both cars have ETC (the system used in Japan to automatically pay the highway fees), so I'm hoping those systems will be a part of the standard package. Highway on-ramps are usually uphill in Japan, and with no effort on my foot's part, we were on the highway cruising along. The car has good visibility, but no rear window wiper, so if you're bothered by rain left there (I'm not), you might want to take notice. You can turn the back camera on for added visibility; with the huge center display, you can have it on full screen or split with your map readout.
The car handled very well. Steering is tight and very responsive. There were no vibrations, and the car is very quiet. You will hear wind sounds when you're driving at highway speeds, and you might even think those sounds are louder than they should be. They are not. What you are used to is hearing an engine working away plus wind, so you don't hear so much wind. I like a quiet car, and both Model Ss were even quieter than I thought they would be.
Acceleration? lol How fast do you want to go and how quickly do you want to get there? The P85 exceeded my expectations by far. To put it bluntly, the car hauls ass. I hit the pedal several times; the acceleration is so fast, I couldn't do it for long. I'm grinning big-time as I write this. Here's the odometer reading after the drive (James was kind enough to let me drive 26 km in his brand new car; thanks, James):