I have received the correct VGA adapter (some time ago) outline in a past post ( http://wp.me/pspi8-gt ). And have used a number of times, not really much to say other than it does as expected. Giving you the option to be the primary, duplicate (mirror) or extended desktop that most windows users have encountered.
The connection to the surface can occasionally be temperamental, but this is minimal. I would avoid 3rd party adapters as these are likely not to have the angled face on the connector to the surface that helps (in the most part) to ensure a good fit.
Andy
The TechLec Blog 