Why is this type of visualization so critical for customer satisfaction? Because closets are three dimensional and not everybody can look at a simple line drawing and visualize what the closet would look like. A 3D drawing allows a customer to clearly see the final product and decide, before construction begins, whether the design is right for them. This is important for functionality and for aesthetics.
A typical rendering is shown below.
You will be able to "tour" the closets on the computer to feel what it is like to enter and walk around. And once printed, this provides a valuable document that guarantees you will get exactly what you ordered.
For most people, this is a valuable part of the design process. In fact, people have come to expect this in kitchen and bath design - why accept less for your closets?