game pads

I've done lots of research on controller / gamepad manufacturer 8bitdo's website, review articles, reddit, videos, gaming forums, etc. but I still am confused and have questions regarding their controllers. I have also contacted them last week but with no reply yet so I figured I'd ask around...

I have three Saitek P2900 2.4 GHz wireless game pads from around 2005. I really like this controller because the size and shape work well with my disability. (For clarity sake, I will refer to them as The Original, The Sequel and Reginald the Third.) The Original is the only one with a...