'scuse the thread necromancy.
I've been using Chain-L for the last 27000+km. Up until this summer I had never got more than 800km between applications. Primarily because I hadn't got more than 800km between riding in the rain. Now that when i do have to ride to the office, I tend to take the Brompton (it's just more convenient for the buildings at each end), I have managed to get 1200km since I last lubed my chain, and it seems to be running just fine. Dunno if I'll get another 400k out of it. Hope so.
But, based on 27000+km of riding, I'm impressed. I've used just under 2 of the 112ml bottles of the stuff, chain's seem to last ok, it collects a lot of gunk on the side plates, and the jockey wheels cake up quite a bit, but it's not really as horrible as the pictures I've seen of some other lubes. It doesn't last brilliantly in the wet. In heavy rain you're going to be lubing up at the end of the ride, but I get the impression that is the case for any lube.
So, to answer my own set of very naive questions from when I had just started cycling. Chain-L goes pretty far between applications, as long as it doesn't rain too frequently.
J