i used to sell, install them. The plus for us is they were made in south florida which is much closer than Pace Edwards which comes out of California. They are a bit more fincky than PE, but over all good covers. Their tolerances are very tight, which is what makes them fincky. Roll n lock is a good choice, but take a look at what Pace Edwards has to offer. I've had the original RNL and PE's Bedlocker and original cover. I really like the Bedlocker and Jack rabbit covers.
I have had the Pace Edwards electric, and I compaired it to a friend of mines RNL and I never had the jamming problems he did. The only problem was and we both had the same problem is they do occasionally leak mostly back near the tailgate in the rail part which caused drips inside the bed.
I am getting ready to purchase another one, PE gave me good customer service even replacing the roll top that was damaged by the shipper on the first one that arrived with another one.