It has layers, it zooms, and it has the useful template tool for outlining. The pens size and opacity are set using a drag left or right, and up and down.
...and that's about it simple and accurate.
The undo is a two fingered left swipe which seems to work without issue. The positioning of the shape tool is one of the only tricky things, especially when you try to position the shape template near the edge of the page.
Export to illustrator and photoshop, save to the photo library, or all manner of other places... and because it's linked to creative cloud there seems to be 2Gb of online storage available, and the ablity to share your work with a community using the Adobe Behance portfolio tool. I'vve shared my pic and will follow up on the community and Behance tool some time later.
Sketch today was draw a school... so it's a school of fish.