Having owned at least 3 such devices, I have to disagree. It "works", but desktop apps expect desktop interactions, and touchscreen functionality feels cobbled together at best. There are a handful of apps developed specifically for touchscreen PCs that work well, everything else is a toss-up. On the other hand, apps developed for a tablet OS support touch as a first class interaction, and have OS support for hardware keyboard and (usually) mouse input if you so choose. Not to mention that the vast majority of combo machines I have used are too heavy to use as a tablet for any reasonable amount of time, or have an incredibly clunky transition method. I have yet to see a platform where touch and mouse can both coexist as first-class input methods. Even the cognitive load of transitioning is an irritation.