It’s not bad, it doesn’t always get it right even with access to the whole code base.
It’s super useful though at getting you started with a function just by you adding a descriptive comment and it’s also great for completing repeatable sequences such as log statements.
It’s only like $10 a month, you should give it a try!
Been trying to convince family and friends to switch; it isn't necessarily the easiest switch, especially for non-technical people, but I hope it's worth it for them.