Big, expensive, and unreliable. The most unreliable parts of most electronics I've owned are user-manipulated wires, connectors, and ports. Taking the whole unit back to the store for an exchange when there's a tiny defect (as I did with my iPad a couple months ago) is actually more valuable to me than the prospect of being able to do maintenance and component replacements on something the size of the box an iPad comes in and twice as expensive.