Here is a list of benefits of using a mechanical keyboard over a standard keyboard: 

1. They last longer than standard keyboards.
2. They’re faster and easier to type on.
3. They’re more responsive to keystrokes.
4. They provide stronger feedback while typing.
5. They’re more precise. 
6. They’re more comfortable.

While you have asked for benefits make sure to consider the cons as well. The general consensus for example seems to be that mechanical keyboards more comfortable, this is mostly up to personal opinion. Make sure to try a mechanical keyboard before accepting the opinion of the majority.
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