Apps function just as you'd expect-they're small programs that look great and really take advantage of the nice screen. They are all professionally designed by Microsoft, though a couple are really worthless (ahem, Shell Game... Of the Future), but hey, they're free!
Or, rather, they're "free," since Microsoft has apparently decided to sell ads against them. The ads show up during app launch, which takes an astonishingly long time. Booting Chess took 30 seconds, though I suppose one could be grateful for the Kia Soul video that gives the eyes something to do.