The Kindle Fire implementation of Android is pretty decent. It runs everything on their Amazon AppStore which has no restrictions on Android APIs and such. It costs $99 a year to publish to their store, but the first year is free. I actually have not tried developing on a Fire, but I do have an app on their store.
As you may know, BlackBerry Playbook now can run Android apps (they have a Dalvik VM running in the OS), but they limited developers from a lot of lower level stuff like interfacing directly with a camera. I haven't tried OpenGL performance on mine, but lightweight android apps run terribly when scrolling and drawing UI animations. Actually, on second thought, everything runs terribly on BlackBerry Playbook...