I have an SD System 3. It works great, but composite video output is a little washed out. If you already have a Turbo Duo then I would just mod and stick with that. If you don't then the SD System 3 is worth it. By the time you buy the duo, mod it, and replace all the caps, you'll probably spend way more than the SD System 3. It will work with your TG16 in case you didn't know.