I too have used ProfitUI, but perhaps a little longer!
I've seen it go through the many different iterations, and each time it fell behind, someone eventually picked it back up and took on the project! I'd like to thank all those developers, you have all made my EQ2 experience better.
The last time it fell behind however, I switched to DarqUI (actually the Live version) and found the transition fairly easy. The developers also seem to be on top of things. I'm not saying you should switch, a UI is a personal preference. I just want to point out another alternative in active development that wasn't so much of a change from Profit that I felt lost.