Hi Matt,
I don't have any experience with TESC but I can tell you that Excelsior has been awesome so far. They have answered questions quickly and helpfully. They've rarely made a mistake and when they have it's been something small. Then they've apologized and corrected it immediately. Which is important to me. I think that how an organization/school handles mistakes sometimes says more about how much they really care about their customers/students than the things they get right.
Anyway, there's my vote if it helps.
