Free/Go users: does “Think harder” actually work?

I’m on the Go plan, and I have the “Think harder” button available. However, when I turn it on, I honestly don’t notice much difference compared to having it turned off. The answers seem to be about the same in terms of quality and reasoning, and I also don’t notice any significant difference in response speed. So I’m curious about other Free and Go users: does “Think harder” actually work for you? Do you notice a clear difference when it’s enabled?