What Makes a Great Product?

What makes a great product? Number one, the product should solve a user's problem. The second piece around it is, when you solving that problem, does it build a sustainable enterprise and business around it? And that's what i would say are the two fetets of a successful product. It does what it is supposed to, it solves the problem. And then, while solving the problem, it is building a sustainable enterprise around an another question we always ask, what makes a greatProduct manager?