That NT4 is a cool looking mic. I don't know if I would buy one though. I think you're better off getting a couple of small diaphragm mics and placing them yourself. That way you can have more control over the imaging. With this mic you're pretty much stuck with the 90 degree array that is built in.
I guess if a person really liked the sound of it though it would be nice to have. It would save a lot of setting up hassle.
Taylor