This, so much. My code since using Copilot is easily ten times better tested than it was before, and I wasn't especially lazy when it comes to testing.

Given 1-2 hand-written unit tests, Copilot can start filling in test bodies that correctly test what's described in the function name. When I can't think of any more edge cases, I'll go prompt it with one more @Test annotation (or equivalent in another language) and it will frequently come up with edge cases that I didn't even think of and write a test that tests that edge case.

(One great part about this use case for those who are a little antsy about the copyright question is that you can be pretty darn confident that you're not running a risk of accidental copyright violation. I write the actual business logic by hand, which means copilot is generating tests that only interact with an API that I wrote.)

Testimonials of this form are near worthless to a company. Maybe it's true for you. Statistically, it's highly likely to be misleading.

People overestimate their willingness to pay for something for a number of reasons, but one of the biggest is that they incorrectly visualise what the choice to pay or not looks like. They often imagine a moment of abstract choice after which everything remains exactly the same but some small amount of money magically vanishes from their bank account. In reality, paying for something is a tedious inconvenience, and not paying for it more often takes the form of never getting round to putting your card details in than consciously deciding "this isn't worth it".

It can be taken to questionable extremes, but there's truth in the idea that the only real evidence as to what customers will do is what they actually do, not what they say they will do. I don't know if their interpretation is correct, but it sounds like Kite at least has evidence of the former sort.

(Don't have much experience with it)