Much as I like the Roadster, I'm extremely pessimistic about Tesla's chances. Established auto companies with much deeper pockets would have trouble bringing the Model S to market. Tesla hasn't been very successful selling the Roadster, a car whose $100k price tag ensures it's selling to a demographic that doesn't care about service, warranty, or battery-replacement costs. The Model S will be an order of magnitude more difficult to sell, even assuming they meet their own overly-optimistic development schedule.