I find myself on the edge of trying out ASP.NET MVC but there is still "something" holding me back. Are you still waiting to try it, and if so, why? If you finally decided to use it, what helped you get over your hesitation?

I'm not worried about it from a technical point of view; I know the pros and cons of web forms vs MVC. My concerns are more on the practical side.

1. Will Microsoft continue to support ASP.NET MVC if they don't reach some critical threshold of developers/customers using it?
2. Are customers willing to try ASP.NET MVC? Have you had to convince a customer to use it? How did that go?
3. Are there major sites using ASP.NET MVC (besides SO)? Could you provide links if you have them?
4. Did you try ASP.NET MVC and found yourself regretting it? If so, what do you regret?

If you have any other concerns preventing you from using MVC.NET, what are they?

If you had concerns but felt they were addressed and now use MVC.NET, could you list them as well?

Thanks