The pre-update version of Gemini Advanced-- sold as a miracle worker-- wasted so much of my time in two small coding projects that I'll never touch it again. Constant hallucination, constant flip-flopping between the same three mistakes generating code no matter what the prompt was like... a much earlier version of copilot has steered me wrong a few times in fairly annoying ways, but is so helpful in smaller ways that it's been a net gain, though not a huge one.