I ordered my custom 170 on Monday and it arrived here today already and I couldn't be more pleased.
The anodizing and bezel/tailcap alignment are all perfect and so is the beam. The "click" action is the most responsive and precise I've ever experienced and has much better action than the EX10 or LF3XT. The SureFire E1B/E2DL tailcap is great too, but this is the best option for a light routinely requiring multiple clicks in succession.
It took me a few minutes to realize I had to actually enter into the customization mode before changing the levels, but once I did it was extremely easy to change each setting to my liking.
I don't mind the clip as much as some here do, but I think it would be better if it ended just before the body narrowed and was about 2/3 as wide. I do like the deep pocket carry aspect, but the resulting clip protrusion out of your pocket is just so large and noticeable. It does work well on a belt, but I think most people use the clip for pocket use.
To me, this is about the perfect light. From the UI to the form factor, size, weight, output, quality, and versatility; I can't think of too many ways a small EDC light could be much better. It's not the best CR123 light for every situation--I think the SureFire Titan T1A and E1B still have their strong suits and are better for cetain tasks--but I think the Clicky is the best overall CR123 light out there.