It's very powerful, I can enter implementations for any algorithm by typing 5 words and clicking tab. If I want the AI to use a hashmap to solve my problem in O(n), I just say that. If I need to rewrite a bunch of poorly written code to get rid of dead code, add constants, etc I do that. If I need to convert files between languages or formats, I do that. I have to do a lot more code review than before, and a lot less writing. It saves a huge amount of time, it's pretty easy to measure. Personally, the order of consultation is Github Copilot -> GPT4 -> Grimoire -> Me. If it's going to me, there is a high probability that I'm trying to do too many things at once in an over-complicated function. That or I'm using a relatively niche library and the AI doesn't know the methods.