I have been iOS for nearly 10 years now. I have used many apps for many years, and more often than not they drop in quality and eventually disappear.
Not Japanese. Japanese is the one app that has stayed amazing in all the years I have used it, and the last update made it even better. The handwriting recognition is a godsend for this app, and it works better than the alternatives (in fact the only alternative that could do something similar to this has not been updated in years).
This is a fantastic app that I recommend to both Japanese learners and those who are fluent but doesn't hurt to have a dictionary around. I'm sure it will be the best tool I will have when I go to japan.