The thing I like most about my Eiger is the QTC.....I like the quirkiness and the fact that Peak would use this tech knowing that some will diss it. I have more consistent lights, but the QTC Eiger is almost like a life form. I really like it.
One of my favorite things about QTC in lights is that the QTC somehow works perfectly with light's logarithmic scale of increasing brightness.
What I mean is that on lower levels I can increase brightness 1 lumen at a time with little twist.
At higher levels, the same little twist will give me 30- 40 lumen increase which is a more appropriate visual increase at the higher levels.
To the eye this gives a smooth gradual increase in brightness from zero to full brightness.