I know it sounds ridiculous, but ~1-2 nights of absolute terror per week is totally worth it compared to how it used to be (getting maybe ~1 good night of sleep every couple weeks.)
I can think of a few reasons I might have avoided it, but who knows for sure. I wasn't on it that long (about a year? not going to look it up), I as a general rule do not remember my dreams unless I'm interrupted, the underlying cause of my total insomnia was pharmalogical, I've always had some level of sleep disorder, I've been on every other sort of sleep aid, I used it with melatonin... who really knows.
They work very well for me and I've noticed no side effects.
I've been taking them about 2-3 years now.
FWIW, I found Dayvigo to work better than Quviviq but they both do the job.