The second question that is important to ask a manufacturer is “What exactly do they manufacture?”.
You want to make sure that whatever their manufacturing is in line with what you hope to produce, because if they already have the machines tooled and ready and lubricated. The process is down, then that’s the manufacturer you want to go to.
You don’t necessarily want to go with the manufacturer that hasn’t manufactured what you hope to manufacture and doesn’t have that process down to a T.
A subset to that question is, who are they working with.
Now, they probably have signed some form of NDA, so they can’t tell you exactly who they’re working with, but can tell you what they’re producing and the industries that they’re working with to give you an idea of what their breath and scope are.