Does someone have some experience with Pusher already? Connections seem to be the most critical limitation. As mentioned on pusher.com, a user that opens an application in two browser tabs at the same time counts as two connections. It would be interesting to know whether robots also count as connection (if yes, this could bring the free plan to the limit of 20 connections immediately).
P.S.: This post is not a statement against Pusher. I just try to understand how it works.