Today my rotary got a lot of use and I really appreciated the UI. I was putting my Xbox 360 back together (out of warranty, been hacking repairs myself for a while) and putting a warm MCE emitter in my TK30 (my 1st mod...). The late evening light through the windows along with the inside lighting was not adequate for most of the work (not enough light, shadows, etc.). The rotary allowed me to fine-tune the brightness instantly with one hand so that I could see my work adequately without washing it out. I was also showing someone how to change a setting on their phone using the buttons next to a shiny screen. I was able to fine tune the output instantly to light up the buttons without washing out the screen or having too much light reflect back. Adjusting the output was automatic. This was refreshing since I have found myself usually using the rotary in max output.
Also, my light had its first drop today, I was holding it in my mouth and dropped it, around 5 1/2 feet onto a hard wood floor. The light is so solid it sounded like a small hammer hit the floor and the light didn't skip a beat (I know its not concrete but still). The clicky interface was also useful. I found the fine tuning of the rotary interface efficient and automatic, but it was nice to go out into the garage and click-press-hold into max and light up everything to find a few tools.
Next on my list (hopefully around Christmas).... HDS Clicky 17670 all stainless steel, Will it happen?