I also hesitated due to the lack of Tesla presence in Texas. I avoided the 1.5 and the 2.0, but when they released the 2.5, I felt that TM had gotten most of the bugs out. Plus, all the owners gave me feedback that TM was very responsive to their needs. The owners told me that warranty work was being done by the Tesla Mobile Rangers, and it was being done for free. I was very concerned that TM had me sign a written agreement that I understood that warranty work was to cost $1/round trip mile for Ranger service. However, so far, TM has not charged me this fee. I think this is a wise move on TM's part, because of their unique position (new company, new technology). That said, owning a Tesla in Texas has not been too much different than owning any other car, except that one offsets the convenience of Ranger "at your home" service with the fact that you have to wait a few days for service. So far, I am lucky in that I have not yet had a problem that immobilized the vehicle, but if I had, the wait would be a huge issue. I have a 2 car household, but we NEED both cars.
Bottom line, I have not had a problem with the drive train. I am satisfied with the service. I really love having an electric car. I am seriously considering replacing the second car (Lexus LS460) with the Model S. And perhaps replacing the Roadster with the Model S performance model. Also, we have a shuttle at work (Dodge Caravan) and that may be replaced with a Model S. All of these conditional on the market at the time of decision making, but obviously, I am not terribly concerned about owning a Tesla in Texas.
P.S. Not only am I impressed with what Elon is doing with Tesla, but his successes with Space-X instill confidence that he will be able to deliver a successful Model S.
