I've driven it, and I've driven other high end cars of it offers very little that you can't find in other high end cars.
The novelty of instant acceleration is fine, but the insulation from wind noise and road noise are still not on par with high end brands even though there's no ICE (and it's not because there's no ICE noise to cover up, in a modern S Class the cabin is almost whisper quiet), and if performance is you goal.
You don't (knowledgeably) get a Tesla because you want the best car, you get one because you want a Tesla. To me cars like the S Class shame the Model S for trying to call itself a "luxury car", and cars like C63 AMGs shame it for calling itself a "performance sedan"
Its not like going to office/supermarket/school/college/home is a race.
Instantaneous acceleration is nice for stop and go traffic and city driving, but that's inherent to all EVs (A base model Volt as fast from 0 to 30 as a Model S 85)
The Model S also has two trunks and can carry six passengers (okay two have to be kids). This thing is as practical as a minivan and has the performance of a 911 turbo. I find that pretty amazing.
[0] http://www.roadandtrack.com/new-cars/news/a30536/tesla-model...
Too bad they can't get their seat belts to work..
http://ca.reuters.com/article/businessNews/idCAKBN19R08Y-OCA...
https://www.reddit.com/r/teslamotors/comments/6ljmed/tesla_m...