Once, Android's primary challenge was the iPhone: proving that Google's open-source platform - and the devices that ran it - were good enough to share retail space with Apple's groundbreaking smartphone. Now, with dominant market-share and increasingly polished handsets, the battle is between 'droids. Into the fray drops the HTC Sensation, the company's new dual-core flagship. It's certainly the best-spec'd HTC to date, but is it enough to beat Samsung's all-conquering Galaxy S II? Check out the full SlashGear review after the cut.