I think it did gain some traction and had a lot of users. It was a very nice app imo, and quite useful, in spite of occasional weirdness. I think the problem was a lack of business model and/or 'hockey stick growth' that would bring in money sufficient to break even/break out.

They did write some very useful open source Clojure code which will live on. I am very surprised one of the BigCos (Google, Twitter) didn't acquihire them - a very talented team.