There are a few issues I have with the sticky messages, which seem to be heavily inspired by the Network of Innovators messages:
We need to be able to display multiple messages at once, similar to Bootstrap's alerts. This is because a number of our apps, like NoI, can only respond to users on a full page reload, and they may have multiple things to tell the user. Currently NoI stacks the messages on top of one another on the z-axis, but this isn't awesome for usability as it requires the user to dismiss each one to see the sticky below it.
As batu and chris have also mentioned, the sticky notifications should be at the top of the page (or configurable by via CSS at least) so that they're the first thing the user sees when they load the page. As a case in point, I didn't actually see the sticky on the style guide until after I read most of the page; this is suboptimal because sticky messages usually have relatively urgent information.
There are a few issues I have with the sticky messages, which seem to be heavily inspired by the Network of Innovators messages: