Bilingual, Bicultural, Dual Citizen?

I recently found out that Vietnam is offering Dual Citizenship to a certain set of people. I found out that I would qualify, but not my daughter. So I have been pondering the question. What would be the advantage of dual nationality? What are the disadvantages? Vietnam is still a communist country, so there are a lot of restrictions on its citizens which have been easing up. There's a lot of distrust about the motives of the government. I have until 2014 to decide, after which the program expires and you would have to apply as any other foreign citizen.