Just bought procreate a few days ago on the itunes store (3.99 Euros currently).
Here are a few sketches I did on it (finger painted, not got a stylus yet).
It's a really good art tool. I'd recommend it if those are looking for something other than Sketchbook pro. This and artrage provide more of a painter/traditional style workflow. I picked this over artrage as it was cheaper! (Also I have Artrage pro on the pc so was just interested in seeing the differences).