The Amazon Appstore has long been clunky and slow for anyone who doesn't own a Kindle Fire tablet -- even for basics like app updates. All that pain is now a distant memory, however, as Amazon has just overhauled the stand-alone Appstore for Android with a genuinely modern interface. The new client has sidebar-driven navigation that feels at home in the KitKat era, and it's much faster when browsing titles. If you've been ignoring Amazon's alternative storefront for a while, it may be worth returning for a second look.