A cross-functional team I was working with last year had three testers offshore in India. The rest of the team (about 15 people) was co-located here in Stockholm.
Some team members had a nagging feeling that they could go so much faster if the testers also moved to Stockholm so they went to their boss and asked. The reply was that testers are so much less expensive, by a factor 2.3, so it was not possible, unless they could settle with fewer testers.
So they decided to do an experiment for a few months. They moved one of the testers from India to Stockholm and dropped the other two testers (re-allocating the other two to other teams) to see how that would work.