Yes, very much so.
I've been able to get Gemini flash to be nearly as good as pro with the CC prompts. 1/10 the price 1/10 the cycle time. I find waiting 30s for the next turn painful now
https://github.com/Piebald-AI/claude-code-system-prompts
One nice bonus to doing this is that you can remove the guardrail statements that take attention.