Honest
To be number one in your job, in your business or whatever your professional field you are in- you have to be honest about your company, honest about your product, honest about your project, honest about your job depending upon responsibility assigned to you, honest about advantages & disadvantages about your products & projects, honest about the various commitments given to your clients & customers, honest in financial dealings with your clients & customers.
Because people who have reached ,attained & maintained number one position for their products, for their projects, for their companies, for their job responsibilities, they all were & are absolutely honest in their business dealings with their clients & customers. Manipulative, deceitful, wrong information percolated to your clients & customers will lead to very short & unsteady achievements of your products & projects which will not last long. So always BE HONEST ABOUT YOUR PRODUCT ADVANTAGES.