I highly recommend if you like to sketch or water color. The drawing above is of my dog I did while we were lying in bed one morning in about 20mins. It was the first time I used it.
The one downfall I have found with the 53Paper app is that it only exports to Tumblr and Facebook. I would prefer Blogger and Twitter. The Tumblr for #PTRdesigns will primarily just be digital sketches exported straight from my iPad to Tumblr as I work on them. See link below. I hope to start adding one sketch a day. I was thinking a sketch every morning right when I wake up and I am still sort of in the dream realm. I will update shortly on that idea.
Here is the link to the #PTRdesigns 53paper Tumblr: http://ptragonetti.tumblr.com/