I believe the initial estimates for the budget were extremely optimistic. I believe after Congress almost cut funding on it, they came up with a very realistic

I believe the initial estimates for the budget were extremely optimistic. I believe after Congress almost cut funding on it, they came up with a very realistic budget and schedule and have been following it very closely since. I know people who are working on the testing, and it seems like they aren't cutting corners. So I wouldn't worry more than normal for deploying a 6.5 m telescope in space.