I am very happy with my Extang trifold soft cover. Just bought my third one for the new truck.
They are dry enough for what I carry in the bed. They are simple o fold up and secure. They are also simple to remove.
With one I was 500 miles from home and got a great deal on a lawn tractor and trailer. Removed the cover, loaded the equipment and place the cover alongside. I can do all that by myself.
Sure - someone could cut into it but just about anything can be broken into.