Actually, I installed it because I'm not totally happy with the Popup Blocker functionality and Ashman shows no signs of updating it any time soon. So far Ipsum seems like a better fit for me. The way things were I felt like I was having to clear notifications too many times because something wasn't getting cleared, be it a statusbar icon, or a badge, or something in NC. So I'm going to give this a go.*
At this point I'm pretty happy with my setup, so if it isn't perfect I think I can live with it.
*For now, I'm keeping Popup Blocker as well--basically, if I want to totally dismiss something I'll use the Ipsum gesture, which will wipe the alert, the badge, and the NC entry. If I just want the popup to go away I can still use the Home button to dismiss it via Popup Blocker, which will leave it in the NC for later. Best of both worlds, perhaps!