Deploying updates to production sites when the US is sleeping is a massive boon, it was one of the reasons my previous employer did all their R&D in New Zealand. The downside is that pagers tended to go off in the middle of our night when server load was highest.

The company has been extremely successful, but the software is complex and recruiting and retaining skilled employees here has become an issue for them. I think they've been forced to move some R&D over to the US as a result.