Phobos vs Tango! What's your opinion?

[Bradley Smith]

Dan wrote:
> Fortunately, we have both libraries available for D, and I think the duality is definitely conducive to the language's development.  I can also say that it hasn't been a problem by virtue of the fact that a program may use *either* library *or* both according to your preferences.

Both? How do you use both Phobos and Tango in one program? I thought 
they were incompatible.