The nuvinci is certainly capable of keeping your cadence consistent, but to constantly think about your cadence and be perpetually adjusting the shifter to keep your cadence at 75 (or wherever you want it) becomes annoying, IMO, I want to click a gear and leave it, till my cadence becomes faster, or slower than I desire, then change one gear, where to maintain a steady cadence with the Nuvinci you can never let "your shifter" out of your mind and it requires constant tinkering/attention, it detracts from the simplicity of riding a bike, for me.

Ultimately, its just not for me, and I have no problem admitting that I'm not really the target market for much of anything modern in the bicycle world.