There are several apps that offer similar function, and are well established (Evernote and Catch), so I don't know that there was an urgent need from a user's perspective for Google to come out with something similar. That said, I've always failed to see the value in these apps, but will take a look at Keep merely because it's from Google. Who knows... I may yet see the light, and possibly move to something more full featured like Evernote or Catch.