Huh, they look more "pro" now. Mine was inside of a cassette box. Seriously. But the dyno didn't lie, went from 142 to 149 *and* got rid of that lean blip slightly off idle. There were no negative side effects. Like Oscar said, it just adds slightly more time to each injector pulse, so it can't REMOVE fuel from the programmed curve. But it also just stops working if it dies and doesn't affect the bike. I'd recommend it.
I saw a UFO after leaving their place to ride home. I'm certain it had nothing to do with being awake for 24 hours riding in the desert and sitting in a hot dyno room.