Overall a great idea, though not a fan that you can’t directly change the temperature on the soldering iron without the power station.
Once you set the temperature, the iron remembers it and you can use any power source.
We've spent a lot of time talking to engineers and makers who solder all day, and it turns out that most people rarely change the temperature. Pick a temperature you like and leave it there.
Our heating algorithm detects and dynamically responds to load, so you don't need to turn the temperature up for larger thermal masses: it'll add as many joules as required to get it to temperature.
It's hard to argue because that's mostly what I do. But it feel really odd for a soldering iron not to have a temperature control right on it. Especially given competitor irons have screens and buttons. Going to a web interface seems insane in comparison to pressing some buttons.