I've had the 2/1 pot calipers on mine since day 1. I've tried a host of different pads & fluids.
For daily driving they really aren't a problem, the occasional hard braking here or there. The problems comes once you start driving like an asshole and use the brakes hard.
They may stop once or twice nicely from 100+ leptons, or they may give a few minutes of confidence inspiring braking but once you start generating sustained heat and you start smelling the pads, I can guarantee you that the pedal will start to feel softer and will require a lot more effort to use then it was a few minutes ago. It sucks
All the heat that these smaller brakes can't dissipate means you need to be spending more time maintaining the brake system afterwards as well. Checking sliding systems work, lubing them, rebleeding the system, checking wear on pads etc etc.
And at the time this was with an NA. I bet with more power the threshold for the heat being generated on a tough drive would be even less.
I've thought about sticking with the 2/1's on mine, but upgrading to DBA discs, braided lines, different sets of pads, the full works in order to counter the heat as best as possible.
But when you put all that into £££, you're not really that far off just getting the 4/2's which have a higher braking potential with the same set of mods.