I have been using Johanna for a couple of days now and like what I see, though usually I play support or ranged units. When I saw the trailer for Johanna and her potential i knew I had to play her. I was not disappointed. Her slows and stuns are really good, great health regen, and both her ults are pretty good. The two main builds are the eternally slow build, which keeps enemies from escaping and her sustain build, which keeps you in the fight destroying enemies. Have fun and let me know how these builds work for you. I will be updating these as I play with her more so check em out in a couple of weeks