It's always a challenge to promote your brand to people out there, especially the big companies. A very good PR, IMO, can draw interest from potential clients. But then you have to present yourself in a way that you really do know what you are doing. And then you walk the talk. A good tracking record can say a lot about you and what you can do. PRs are usually good in communicating, but then it's rare to find those that can walk the talk. Ah oh, I think, at the other end, there should be a good customer service as well, just in case things don't work out the way as expected and vice versa.