It works for me as a recce tool – take a photo, write and draw my notes straight onto it in situ. The writing element isn’t so much because my hand writing is lovely (its awful and with the pencil it’s worse) – its more that it’s quick and I can do it standing up, where as typing at any speed is a two handed job. For speed -writing and drawing with the same ‘tool’ is quicker too, rather than having to switch to text and draw text boxes then switch back to a drawing tool.
As a drawing tool for sketching / visualisation / presentation purposes it’s probably unsurpassed.
A key to it all working well is a good case that holds the pencil securely (its a slippery devil) and keeps it easily to hand.