Been running my KCNC crankset for about 3 months now, riding around 20 hours each week (out time), it takes some careful installation – follow the instructions, and a lot of torque (30Nm) – but once setup is great. The Q-factor means that your pedalling is more efficient and you dont get any shoe rub on the crank arms. The shifting is spot-on, and they look very nice too.
The arms and the axle is very stiff – I dont notice any flex when mashing the pedals.
If you get a chance, have a word with Clee-Cycles – they’re very informed, incredibly helpful and will be able to sort you out a set and also work out if they’re right for what you want.