You have to remember too, any soft bed cover is a pain to deal with in winter. I have had the undercover brand and love it. 2 locks and it goes up and comes off in 5 min.
Never had any issues with my undercover.
I have one of the roll up covers on my beater truck. It sucks. Least bit of snow or ice and it won't roll up.
The flip covers, with any snow or ice on them, won't fold for the life of them.
Fiberglass covers are way too heavy. And you won't want to take it off by yourself.