Qshake
The point I was trying to make in my original reply was that kji120 make sure that the services that BSDI offers were really necessary.
As I said this is not an off the shelf software, it is a company that provides a service. They are essentially part of your project team. So if you are hiring them to help you, you have to put a certain amount of trust in their results.
When you work with them it feels like you are working with a black box program, but then in some ways so is every other off the shelf program that does curved steel design (MDX, DESCUS) and I know designers who have found errors in the results of both sofware packages and have had to call the software support team to help them out. The difference with BSDI is that you are already working with them to get results customized to your project. We used BSDI to help us with our project because we could not get the results we were looking for with a normal FEA program, or commercially available software. I am sure given enough time and money we could have done it, but we had limted amounts of each.