From Wiki

[edit] Requirements

Some of the requirements include:

• Having been employed at the company that will sponsor you for at least a year
• Be in a managerial position, or maintain specialist skills/knowledge of the company

[edit] Pro's

• It has dual intent, meaning your employer can sponsor you for a Greencard
• There isn't a quota cap limit like on the H1B
• Spouse may apply for an EAD to allow work

[edit] Con's

• Children can't apply for an EAD, so they cannot work