A fine trigger is indeed and thing of beauty to use. My Feinwerkbauw pellet pistol has a 2oz. 2-stage trigger - 1oz. to yard it back until it comes up hard, then the second oz. to set it off. I also use a 3oz. trigger on one gopher CF gun and had about 4oz on my .45 longrifle, but hardened it up to about 8oz.
The 'wire' is indeed interesting - I've never seen anything like that before - but - with very light triggers, too much width of the trigger itself doesn't allow you to properly feel the 'trigger'. You've got to be able to lay your finger on the trigger and feel the pressure build as you squeeze it off. If it's too wide, (or the skin is too thick on your trigger finger) this is not possible. This is why I sand my finger for shooting 'fine' triggers.