Simply Great
I needed a simple way to quickly diagram very simple wiring and eletronics layouts. This fits the bill perfectly. Editing is simple, quick, and intuitive. Its got the flexibility of a plaintext editor but with a graphical twist. I would love to see iCloud support, basic VIM keybindings when using the text tool, and support for unicode character shortcuts that dont collide with the tool shortcuts (for example, option-v should insert a √ when using the text tool, but it changes to the selection tool instead). Being able to choose from other installed monospaced fonts for editing would be great too, but I sort of like the chunky one it comes with.
If you are more comfortable with a text-editor than a word processor and you are looking for something to quickly create simple diagrams this is perfect. Just be warned, keeping with the simplicity of what you create is the simplicity of the app itself - it provides *very* basic functionality. Dont expect too much from it.
Jeff Remer about Karo Graph