I've found pair programming has helped in the past when working on really complex or convoluted code. I could sit for a day myself and maybe get my head around

I've found pair programming has helped in the past when working on really complex or convoluted code. I could sit for a day myself and maybe get my head around it, or pair program with someone else and between the two of us we get it knocked out in a few hours. If you only have a simple code base, I think pair programming doesn't have a lot of value. But when you are in a 5million + LOC legacy app, pair programming can help a lot IME.