[edem]

No it __is not working fantastically well__. I speak from experience. There are also numerous studies (I can link to them) which detail why pair programming wastes time if not used for the right problem (mentoring or super-difficult task).

[Huggernaut]

Seems fair to say in some cases it works fantastically well, in others not at all?

[edem]

Yes. Pair programming works well if someone is being mentored or you are facing a very hard problem. In other cases it is a waste of time. You can read a lot of studies about this topic.