I used MS Office Copilot...
and for someone who knows how to use their computer, it's useless. But our company's pilot run of it (their pun, not mine) showed a lot of folks enjoyed it and it boosted their productivity. Because they:
1. Don't know how to create simple Excel formulas or conditional formats
2. Can't be bothered to read their emails, they need a summary instead
3. Can't be bothered to read their IMs, they need a summary instead
4. Don't know how to create a simple PowerPoint presentation
In using it for code, it seems likely to dramatically decrease code quality. After all, Copilot doesn't understand code, much less the security implications in writing it. It just knows that when x follows y, then usually what's next is z. If the training data contains, for instance, an out of bounds read (and given the reported size of the training set, there are probably many examples), then YOUR code now does too. Are you skilled enough to spot and fix it, or just say "computer says so"?