I received my DX lights yesterday (USPS required signature for delivery, for some reason...there was nothing on the packaging that indicated that was necessary
).
Initial impressions: the K-106 tail buttons are shockingly difficult to press (coming from the silent and easy-to-operate piston drive of the Nitecore D10). The Nitecore also feels like a more substantial light, with better fit and finish, smoother threads, and a UI that's less finicky than the DX lights.
The glow in the dark rubber parts on the 5-mode K-106 are pretty neat, and both the Akorays have surprisingly good quality for sub $20 lights. I'm not sure how well the clips will hold up, but at least they are removable.
I'm going to play with these lights further, but as of right now, if I could only have one light, I'd go with the Nitecore if I could afford it. However, if I couldn't afford the Nitecore, I'd probably be happy settling with the Akorays (I liked the 3-Mode better of the two, since I could program the modes to avoid strobe and SOS).
Here are some pics.
1. Straight out of the packaging:
2. 3-Mode K-106 on the left, 5-Mode in the middle, and D10 on the right:
3. Beam shots: