There is a slight lag between the keys, as many have already noticed. But when you're playing retro games, it's really barely noticeable. I really like these controllers and they are pretty easy to install on my retropi. Basically plug and play. The buttons feel great, the quality seems fair because it's not the 'real thing'. I would definitely recommend them and would buy them again if mine ever stopped working. I've had them for a few years now and they still work!
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