i have one of these btc capacitive keyboards, but it has springs rather than rubber domes. it is horrid to type on. they're completely linear except during the last 10-15% of key travel where you're compressing the bit of open cell foam that is sandwiched between the bottom of the key stem and the plate. that feels as awful as it sounds.
it's possible that the btc keyboards with rubber domes can feel better than the ones with springs, if the rubber domes are designed to be tactile.