Bad UI The problems are fine in and of themselves, but the interface is really horrible. It does a really bad job of marking problems as solved correctly, and makes it very painful to get to the next unsolved problem. This could be a good app with some sane UI considerations.
I love it! I really love this app. I love that it keeps track of your progress and it even gives you a ranking. I also like the explanations it gives after you attempt a problem. Last but not least, the graphics looking really sharp.
Good set of problems with useful comments. Some of the value of some of the comments is lost due to missing coordinates or symbols in the graphics. Clumsy user interface, should be possible to significantly improve it without too much additional work.
Good Beginner Problems I can never find an app to recommend to total begginers since most apps seem to start around 20kyu. This helps a lot.
Horrible interface The horrible interface makes it a PITA to use the program. Also, in some problems stones are referred to by their coordinates, which are not shown next to the board.
Buggy Doesn't track when I complete a problem sometimes. Not as polished as the iOS version. I would definitely use it if it wasn't buggy.