Following HP's disastrous previous entries into the tablet market, there is clearly a lot riding upon the 7-inch shoulders of the HP Slate 7 HD. Given the value of the tablet PC market, this is an area that HP can't afford to miss out on.When it comes to the modern tablet market, there are two clear winners, in the form of Android's OS and Apple's iPad range, although Windows 8 tablets have slowly started to provide a decent third option.Recent news that Android has now overtaken the iPad in tablet dominance is no surprise given the wide range of price tags that it covers, from the highest-end Samsung Galaxy Note Pro 12.2 all the way down to the much cheaper Google Nexus 7.That is where the HP Slate 7 HD sits, running Android 4.2 Jelly Bean for the rather reasonable price of £129 (about $215, AU$239), or for £169 (about $282, AU$312) if you want two years' worth of free 3G data (250MB per month) included.For the added cost you also get double the internal storage, up from 8GB to 16GB, so it's starting to look even more reasonable. The Slate 7 HD is one of the cheaper Android tablets out there, which may help it against the likes of the Kindle Fire HDX, Tesco Hudl and Nexus 7.