I have one and the only problem I had is when the kids were playing with it and it rolled back up unevenly. I had to slowly & gingerly pull it all the way out and hold it as it slowly retracted. It has been fine ever since. I got mine off the GMC website, along with the cargo net that goes across the back, for $150. I've seen them advertised on the JB Whitney catalog, but I'm not sure if they're OEM or after market knockoffs. JB Whitney's prices are cheaper, so I would expect them to be aftermarket. But as always...you get what you pay for and ALWAYS KEEP YOUR RECIEPT! My wife's motto...just thought I'd throw that in for dramatic effect. Although it has saved my butt quite a few times in the last 3 years.