(Reuters) – Apple Inc has not reinvented the wheel with the iPad Air, but the thinner device, priced higher than many of its competitors, is a major improvement on a successful product, the reviewers wrote on Tuesday. Writing for the Wall Street Journal, Walt Mossberg called the iPad Air the best tablet he has ever reviewed. That isnt just because of its slimmer, lighter design, but because Apple boasts 475,000 apps optimized for tablet use – far more than any other tablet platform, Mossberg wrote. (http://link.reuters.com/wyk34v) Mossberg said the new iPad weighs just 1 pound, down from 1. …