It's all a matter of selecting the correct master cylinder. On my H1 I have twin 320mm disks and calipers from a 2009 Ninja EX650. I started out with a 14mm (9/16) master but that was way wrong and I finally ended up with a 19mm (3/4) radial master. The brakes are very controllable and capable of extreme braking but you have to apply some pressure, and that is what makes them so controllable. Fork mods (gold valve) and heavier springs is a must for utilizing brakes like that. They really encourage some spirited riding on twisty roads with late and hard braking when approaching corners. On the downside it has nearly halved my front tire mileage.
Worst thing you can do is to slap on large twin disks with multi piston calipers and then try to use your stock master cylinder. You will have a lot of braking power alright but it will be spongy and uncontrollable.

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