Where have all the original SEGA Genesis 6-button controllers with the Mode button gone? I see newer "SEGA" ones without the Mode button, and the official SEGA / Retro-bit ones with the Mode button, and unofficial Retro-bit ones without the Mode button, and other old third-party ones with or without the Mode button, and unofficial, unbranded ones without the Mode button on eBay and Amazon. However finding old original ones with the Mode button is proving to be quite a challenge, and even if you find one, the sellers want to be paid much more than for the rest.

Are these other, newer ones without the Mode button worth it? I've heard that many of these are too small (only 75% the size of the original or less) or they have really short cords (only 3 feet long) or they have buttons that shift or rattle or the X-Y-Z buttons are lousy or the D-pad is poor.

Which controllers are good and which ones should be avoided? Thanks.