I've completely given up on XF notices, I can't see myself ever using them again and have since replace xf notices and using Chris's notifications. Perhaps they feel the same? Would be interesting to see xf take on notifications.
People learn to ignore them. They work well the first few times, but after that... they just ignore them. Whether they close it out or not it's just a few inches of space on the site that you'd skip like an advertisement.
That's why I rarely use notifications. I am using them on my gta site and got mild results, but not by much
I've got my reasons which have been posted, I see no need to regurgitate the cons I have with it. Thankfully, I found a replacement solution to it in notifications which more than does what I need it to do.