I'm also going on the Vietnam holiday on 16 March - can't wait!  It's my 4th singles trip.  There's normally a good mix of different people (I see it's sold out so should be a few of us), and everyone is really friendly.  I've always found the Tour Managers and local guides to be really good - very helpful and informative.

The only thing I'm not looking forward to is the flight - sooo long :s

Jo