It's hard enough to know what kind of service you'll get from any company, even the famous ones. If you don't know them at all you're even more in the dark. So I offer this guarantee.
ronsuit

Our work is guaranteed to the complete satisfaction of our clients. If you are not completely satisfied with our services, we will, at your option, either waive professional fees, or accept a portion of those fees that reflect your level of satisfaction.

The fine print:

There are no exceptions. If you are not satisfied you don't pay. Here is how we make this work for you and for us.

We have to know before we begin which executive or group will determine satisfaction.

We'll work closely with that person or group to determine what is needed, what our work is intended to accomplish and how that goal is going to be achieved.

Once we have a clear plan in front of us we will need access. We need to be able to meet with you to keep you informed, learn about changes you see in the environment or plan, and get interim approval for changes or milestones on longer projects.