Inline with this discussion and as a follow-on to JohnD's response above, how many here don't use a quick link? When I started riding a "Track bike" (what we called them back in the 70's) I joined the ends back together with a chain tool. I did that to my Wabi's when I first got them and then converted over to quick links when I changed chains.
Although I've not had any problems with the quick links I do wonder about a fixed gear somehow working a quick link off the chain. I've not heard of that happening though.
Thoughts?