I've used Trillian since before the 1.0 revisions. I've kept an eye on it ever since even though development seems to go into hibernation from time to time. They have a blog that keeps track of the new builds.
I'm on the alpha for Trillian Astra and have been for a few months. I wish status bar this was a little bit smaller in size because of wasted screen real estate, but I'm curious just how well this works. See below: