This settlement hasn't been finalised yet, as a judge will have to sign off on it, but the settlement should mean customers in California, Florida, Illinois, Michigan, New Jersey, New York, and Washington can claim a payout.
The payout will vary depending on how many times the customer has had to replace their keyboard. It really does all come down to that. Laywers expect the maximum payout to be around $395 for the unluckiest customers, while those that only replaced their keyboard a single time (so lucky) will receive around $125.
For customers that switched out their keycaps, it'll be around $50.
Though these final payouts will likely vary a bit once fees are paid out.
Customers are still eligible to receive four years of free keyboard repairs, too. A keyboard service program was agreed to by Apple preceeding this class action and it offered customers an extended warranty on keyboard repairs for affected devices (which you can find in this list). This is a worldwide program, so even if you're not in line for a payout you still have this option available to you.
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Apple's butterfly switches were kind of a big deal for the company when it first announced them back in 2015–16. They are ua-thin switches yet it claimed could deliver a decent keypress and travel. That's a matter of opinion, and personally I can't stand the things. Anyways, Apple's claims were down to a winged hinged mechanism, which was wholly different in design to the more commonly used scissor hinge switch.
When it comes to gaming laptops, you'll likely find scissor switches, but sometimes full mechanical switches (low-profile ones) will be used. Though even low-profile mech switches are still quite chunky.
The problem for Apple, however, is that for years now customers have been running into issues with these butterfly keys, such as repeated key strokes or them become unresponsive. Basically, the butterfly switch has become a big problem despite its compact size, and while Apple has replaced these switches on more recent MacBooks with the more traditional scissor switch, it still has to cough up for its previous mistake.