Seriously? I drive a proper baby seal killing gas guzzler, but even I admit the Model S is nothing short of amazing.
Biggest advantage is a S-Class (sort of) sized full size car for 5% import duty.
It is a beautiful car, spec it up properly and you have nearly 500km of range, if you get the high performance version, you can put it into "Insane Mode" (Because Sports Mode is just so 20th century) which means 0-60mph in 2.8 seconds, That's Veyron territory.
Also it can drive itself (Doubt it'll work here in Sri Lanka). Its autonomous mode was so good that they had to reduce functionality because people were not paying attention while "driving".
All this for about 12-13 mil makes it a bargain, only if you are willing to take the risk of an unproven/unsupported product in Sri Lanka. If i'm in the market for a car in that price range, I know I would.