The only real downsides I can find are that: 1) You need to design the selected/deselected states for buttons separately and merge the code. 2) It'll give you

The only real downsides I can find are that: 1) You need to design the selected/deselected states for buttons separately and merge the code. 2) It'll give you drawing code, but you have to maintain those chunks of code directly in your source files. Any modifications you make to the code need to be reflected in the original PaintCode data, and vice-versa. This could be solved with clever comment guards and the ability to rebuild internal structure from the code it generated. Neither of these really detract from the product. I've only used the demo, but it's honestly pretty amazing.