I have one of the 8Bitdo Zero controllers and it’s marginal for my hands, but would be great for a child or anyone with smaller hands. I’m looking but I can’t find much difference between the two models. Looks like there are small mostly cosmetic differences. Though it does look like the new one uses a different electronics as it has updatable firmware while the older FC30 model does not. That could be handy to ensure compatability going forward. I’ll give 8bitdo credit for supporting their products well. Lose the manual? No problem, just head over to the support page. (and yes, you won’t remember where you put the tiny little manual for your tiny little controller and, at some time, you’ll forget what all the buttons to to pair it, etc.)