Well, usually I would say with those All-In-One solutions you get the worst of both worlds - the lower upgradability of laptops and the lack of mobility of desktops. Given you don't really need mobility, but just like to have your computer next to your chair, it might as well be a valid option, as a desktop will only clutter up your living room with cables, and you won't get a cheap laptop with that big of a screen :D