I just began toying with LibBanzai-2.0 a little in a front-end I made for aggro notification in combat text and I noticed the throttle rate on 2.0's polling is way too high. .5 doesn't seem like a lot when you think about it, but I had times when I've been hit 2 times by a mob before I was told I have aggro, and that was off just one mob. Multi-mob aggro in a party could be devastating to squishy classes if you're relying on this lib's notification.
For now, just an annoyance to me honestly. But I hope it gets fixed before I begin using it more heavily.
Edit: Oh, one other issue, is there any reason the unit's name is sent to the callback and not the unit-ID? I think the unit-ID would be a lot more useful, and easier to use. After all if I want the name I'll call a UnitName on it.