Free unlimited supercharging.
As far as long term reliability go, I don't know that the Model S or X will ever be long term reliable cars. Too many fancy mechanized things for that. Air suspensions, door handles, door motors for the X, LCD screens, etc, are all going to be expensive to repair and maintain.
Now, if they seriously simplify the 3 it could be a reliablility powerhouse. Tesla still has to prove that though, so we will see what they can manage long term.
Overall EVs should require less maintenance and be more reliable long term. Chevy posted a very minimal maintenance schedule for the Bolt where it needs its first major maintenance at 150k miles. Thats pretty awesome compared to an ICE, and we will see how long term reliability plays out.