I have certainly never had ASUI running on my machine. I'm pretty sure that I didn't start trying to install it & then stopped. (I'm just trying to be careful in my answer b/c I've thought about installing it many times.)

I have also had times where the alarm went off five minutes after it was supposed to, which is kind of odd. I think it only did that after installing DT. I've also had times where I've awakened on my own to find the alarm dialog sitting open but without making any alarm sound, although I am not certain that this wasn't because of my volume setting.