Bigger Brother

Is it just the braking power that the capacitor affects? My GT2.0 Pro only came with a small 2-capacitor board when I bought it (about a year ago). Was thinking about getting the 4-capacitor board that seems to come with the speedos now.....

Or does the capacitor affect anything else? I've seen the factory drivers (Marc, Elliott, Viktor etc) running with something else different.... again, is this just for braking feel?

Thanks