No I haven't been to Vietnam but it's one of the countries I would like to visit at some stage

I would avoid Vietnam, if you think Guangdong, guangxi provinces are dirty, Vietnam is even worse...

http://cdnedge.bbc.co.uk/1/hi/programmes/from_our_own_correspondent/9367223.stm

As for the economic situation changing, perhaps more so than China, if you find the above article interesting, which I feel you may do...

Cheers with Sangria,
Bullring