Compatibility? Both NDS and GBA please. Just some random games from the web, not the ones that are in current reviews/previews/first impressions, please.
Something about the cart itself, as in, the build quality, et cetera.
The menu. How does it work? Any bugs? Something that could use improvement? Et cetera.
Battery times when playing DS games, GBA games, and homebrew.
In game menu features like RTS/RTL, RTG, Free Cheat, slow motion, et cetera: how do they work, does it work, and also: how does it look?
Other random stuff you can think off.