kj2, will let you know if the clip is any good. I like the fact that it can be mounted in both ways.
I do use efest 10440's in my i3S and it is crazy bright. Most of the time I just use eneloop for longer runtimes and being able to drain it completely. The i3S is also pretty banged up now.
I like stainless steel / Titanium. And I dislike the mode sequence on the i3S. The M-H-L sequence kills my night vision.
Replaced it with the DQG AAA wich size is perfect. Loved the looks. But it is faulty (usually only works in low, unless I tap it on a hard surface), eats o-rings and the customer service is bad. Wrote them a couple of times, they should send a replacement driver but still havent received it (3 months ago).
An EDC light has to be bulletproof.
Besides that, 10440 hardly increases the lumen output of the DQG, wich I like in certain situations. And output on eneloop is too low for my liking. So I'm back to my i3S now.
The thrunite Ti is a bit bigger than the DQG but hopefully can replace the i3S. I think I'll glue a Neodymium magnet on the tail if I like it. I use these lights a lot on my car restauration and the magnet on DQG came in handy. When it's able to handle 10440 with super high lumen output would just be an unexpected bonus. It should be the brightest of the three on eneloop though.
Hopefully someone is bold enough to try and confirm 10440 works or