While this does work for the basics of deviantART, its missing a lot of the basic functionality that I believe the mobile site itself has. For example, a deviants "All" and "Scraps" galleries appear impossible to browse. Some user pages tend to load incredibly slowly, freezing the app either until the desired page finally shows up or until the app crashes. As more of a lurker than a submitter, I cant say too much about the submitting side of things, but Ive heard that editing deviations isnt really possible yet.
But the app works, and its deviantART. I still use the app for its relative convenience - checking notifications and the Watch feed are both easy to do. If you wanted deviantART in an app, this will do the job, though there may be some frustrations. Use the mobile site instead if you desire further functionality and probable better performance.