Are you using a Custom Computer or a Custom Laptop?

When shopping for computers, either desk-top or laptop, most of us would normally pick one off the shelf as opposed to having one assembled by the store as in custom computers or custom laptops. The hardware in the ready-assembled units would suffice as a norm.

A custom computer is needed if one's work or usage demands a more sophisticated system. A graphic designer friend of mine has been using custom computers all the while. He picks out the parts that he needs and have them assembled into a computer that meets his needs. According to him, a custom computer is more robust, of course more sophisticated in terms of attributes, and a lot cheaper vis-a-vis one you get off the shelf and with less attributes.

As for a custom laptop, he hasn't found a store to do that yet. He's using a Macbook at the moment.

Are you using a custom computer or a custom laptop? If so, feel free to share your experience.