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I myself came from a FK1. I'd say ambidextrous mice takes a while to get used to, but the G900 is again another step up from FK1 and feels a lot better than FK1.
And yes, it will automatically turn off after 30 mins of idle, and wakes up in a split of a sec when the sensor detects movement.
Ah the idling is good to know. How heavy are the clicks compared to your FK1? I'm reading a lot from another forum that people are finding it harder to click and because of it misclicking.