I'm trying to document as many third party Sega controllers as possible on Sega Retro. It's a challenge, not just because there are tons, but because nobody likes to talk about them on the internet. This is despite the fact that in a lot of cases, the third party alternative beats the official product. I've a preliminary list of control pads I've found on my travels across the net http://segaretro.org/User:Black_Squirrel/Control_Pads it's obviously unfinished there are more here which I've prepared for but haven't copied info from yet http://www.smstributes.co.uk/allcontrollerhardware.asp some beasts I've already covered. Most haven't been. However, I'm guessing that a lot of you will own third party controllers and can shed some light on the situation. e.g. what separates them from the official versions, the pros/cons, the manufacturers, names, release dates, regions etc. Better photos and box scans would be nice too. There are also several problems regarding older controllers, specifically those for the Sega Master System. It's a well known fact that a lot of controllers are interchangable with other computers (and consoles) of the day, which could mean there's acually a lot more Master System-compatible joysticks than expected. I've spotted arcade sticks which have half a dozen leads for different consoles so things are very confusing.