Since I own a 1.5 and now borrowing a 2.0 from Tesla I see and feel some differences. I don't think there was any power differences between the two, my understanding that only came with the hand-wound sport edition.
The 2.0 seats are more padded and grip your body better, but they do sit higher. Some may like the higher seating... I personally don't since I'm 6' tall so an instrument cluster I use to see clearly is now blocked by the upper part of the steering wheel. I also like sitting lower since it feels my center / cars center of gravity is lower now. It is easier to get in/out of the 2.0 from the higher seat design.
The 2.0 does appear to be quieter and there's less whine of the motor that's heard in the cabin but I personally like the whine... others may not.
I personally like the carbon fiber center console, a real shifter over push button select shifting. The 2.0 console seems in my own opinion cheaper... it shakes, moves, and I can get the VDS display to move all the time within the center console housing which doesn't seem right.
The PEM is allot wider than the 2.0 PEM. So it looks like something is missing when coming from the 1.5.... I do see that the PEM run's allot cooler in the 2.0 which is nice... means your electronics will like you for that. But many Tesla Rangers love the 1.5 PEM since its built like a tank and has aircraft quality connectors.
I actually prefer the tray over the glove-box. I just toss things on that tray and they're easier to access. I bought two tray dividers that fit the look well and keep things from sliding as well as keeping it organized.
One thing nice about the pushbutton drive selector is that when you turn off the car, it automatically goes into park... so one less step. It did yell at me today moving from drive to reverse... saying I made an "unsafe" gear select. I never get that in my real shifter on the 1.5... I wasn't rolling that fast, slightly at most forward.
I do feel some oddness with the traction control... seems more sensitive on the 2.0 than my 1.5. I can usually push hard in a turn without having TC kicking in on my 1.5... the 2.0 on the same turn and speeds I feel its shutting down the accelerator on me. Also there's a bump / drop in the Road that I go over with both these cars on my way to work... My 1.5 doesn't get affected all that much, I can accelerate fully without feeling TC kick in... the 2.0 is limiting my acceleration and there's definitely a delay in there when comparing the two.
The 1.5 has "bullet proof" race type of TPMS (tire monitors), the 2.x's have ones that are not as good and need to be reset lots of the time.
The 2.0 has noisier fans and water pumps than my 1.5. When charging the 2.0 is louder due to the fans and pump.
2.0 has an auxillary 12v battery for the lights and backup system, the 1.5 has it built in and uses sheet 1 and possibly 2 for that. So if anything goes bad with your aux. battery system the pack will have to be pulled to diagnose and repair in the 1.5....
No differences in the Signature series, they're just the earlier editions with emblems to show it. They may later be worth more since there's only a limited amount of those around but time will tell.
One thing is that whichever one you end up buying you'll love it to death, definitely becomes a personal part of you and the family.
