He isn't an expert at anything, and I wouldn't trust him as an expert.
He does seem to have a knack for the tech-interested masses, the ones that spend money on tech devices and there are many of them. How many iPhone users read Slashdot? Not many. How many iPhones have sold? Exactly. His opinion is worth watching for his marketing perspective, not his technical expertise.
The Shuttle is now going five times the sound of speed. -- Dan Rather, first landing of Columbia