is finally nearing its UK launch date of 28 May, there's just one question: is it worth buying? If you already own an iPhone or an iPod Touch and wish it had a much bigger screen, the answer is probably yes – if you can afford £429 for even the most basic model. If you already own a notebook PC and would like something smaller, the answer could well be no; you'd be better of with a netbook at less than half the price. Such rationality may not stop you from succumbing, however.