I personally like the soft.

http://www.jcwhitney.com/truxport-ro.../p2010334.jcwx

I had one on the F150 and Black Betty F350. I never had an issue with anyone taking anything out of the bed because they latch just inside the tailgate and you can lock the tailgate. So they have to cut it to get in it.

I like the fact i can roll it up and have full use of the bed in seconds.

On Serenity F350 she came with a camper shell, while i do LOVE this i do miss the ease of trowing large items in the bed now. If i want to get gravel, or dirt of the yard i have to get a trailer because it takes 2-4 people to remove the camper shell.