Great for vibe coding. I went from prototype to deployed in 20 hours (+ 12 hours for a senior developer to hard code, check quality and security). The fact that it is natively connected to Firebase makes the whole process easier and more intuitive for an amateur developer like me. Having unlimited Gemini credits to make any changes is a real plus. By connecting Firebase Studio to github one can get a real coding environment: development, staging, production. What I didn't like is that sometimes when an error is detected and the agent can't solve it, it gets into a loop trying to fix it over and over again. Also, sometimes even if you tell the agent not to implement or change anything beyond the specific command given, the agent is proactively destructive, it takes the initiative to change parts that were already approved. Finally, sometimes when building the console environment it gets stuck, and doesn't load; I was about to cry thinking all the work done will be lost, but the day after it worked again (why? no clue)

Firebase Studio works well with High Speed Internet only. It has its own highs and lows. With a good built in AI driven development to all Stack by Google, its a good mix. Free tier is ok, but cost increases a lot once you migrate from this.