Well, we have a 4 year warranty as of our purchase date mid-2015.
I have budgeted to keep upgrading to own a Tesla within warranty, and intend to do so prior to mid 2019 when our current S85 reaches end of comprehensive warranty. Battery and drive train warranty till 2021.
So far, $600 total out of pocket maintenance cost over our 50000 km driven.
Everything else was included.
Tesla provided the following service
1. New braking package in late 2015. Upgraded calipers and pads. No cost.
2. Numerous feature upgrades, including automatic GPS based air suspension, continuous climate control, newer google maps in car navigation, supercharger routing with real time energy charts, waze integration via in-car web browser, etc. No cost, over the air upgrades.
3. Two warranty repairs, cabin heater, battery heater. Received P85D loaners during repair period.
4. One time full car inspection late 2016, $600 included new wipers, brake fluid flush/fill.
5. Replaced rear motor. Original motor was strong and smooth, but made a sound. Tesla identified and replaced, no cost.
No issues getting service immediately for warranty work (item #3), next day, with loaner provided.
So yeah, that's a positive personal experience.
The negative about owning a Tesla, it sucks to drive gas rental cars like I did last week.