[Advantages:]
Playing window is a good size; an improvement over Sokosave
Click-to-position-character also has neat show-path visual effect
Great public domain Sokoban levels
Handy keyboard shortcuts
Good color contrast
[Disadvantages:]
CPU Usage! Hogs the entire CPU
No high scores
Assumes same player upon relaunch
[Comparisons]
There are 3 other sokoban games for Mac OS X: Sloppy Sokoban, Sokosave, and My Sokoban. If the CPU usage bug gets fixed, and less importantly, if game user data could be stored, it would be the best available.