VCards — Good or Bad?

Good Morning All. I am the email administrator for a law firm, and our marketing department is asking me to implement VCards. I’d like to ask your opinions.
1) Does your firm use V-Cards?
2) Are they always attached to outgoing messages?
3) How many users in your organization use them?
4) What is the size of your organization?
5) What industry? (Law, Real Estate, Accounting, etc)
6) What are your experiences with them?

Thanks for all your help.
Mike