I think you will be happy with a Dahon just as long as you stay realistic about not overcomparing the two bikes. For the money you pay for a Dahon, I find that the bike exceeded my expectations of a similar bike model in that price range. I am very happy with my bike (a 2003 Boardwalk). It folds more conveniently than a Bike friday since the parts do not separate and stays together in a neat bundle when I board a train. It takes me where I want to go with no fuss or muss. I did not sell my other bike since it performs a different function than the Dahon and I am happy with each one.

So go ahead and purchase a Dahon if it suits your commuting needs. I am sure that you will find like I have that no one bike will upsurp the other in value. Each will offer it's own charm and features.