For coding it is horrible. I used it exclusively for a day and switching back to Opus felt like heaven. Ok, it is not horrible, it is just significantly worse than competitors.
Although it sounds counter-intuitive, you may be better off with Gemini 3 Fast (esp. in Thinking mode) rather than Gemini 3 Pro. Fast beats Pro in some benchmarks. This is also the summary conclusion that Gemini itself offers.