Carousel provides access to a decent set of adjustment tools, though Adobe should probably put red-eye removal on the list for the next revision. For each of the three main adjustment tools--white balance, exposure, and contrast--there's a submenu that you access by touching the double arrows. One really nice feature is the ability to choose auto independently for white balance and exposure. The edits are nondestructive, in that they don't affect the original image and can be changed at any point.
While I generally like the adjustment tools and interface, you'll notice that there's no scale or visual cues, other than intensity, on the slider UI. It would be nice if, for example, white balance showed the extents for warm and cool.