Not Good! My riding partner for the Great Divide Mt. Bike route this past summer had the front and rear nashbar waterproof bags. They were constant trouble to us and took away from our riding time. Some of the problems will be detailed below. Attachment system--At least once daily they would become airborne on rough descents...yes, they would pop completely off the bike rack and go flying. This wasn't good for the outside material of the panniers or the contents inside. If they wouldn't fly completely off the rack, one of the attaching hooks would come off while the other remained which made for a dangerous situation as one part of the pannier was close to the spokes. At one point of frustration in NM (very rough roads) we actually got out the roll of duct tape and taped each pannier to the rack. All of the carrying straps/handles ripped off by the end of the trip. The rivits holding the top hooks onto the panniers broke off after 2,000 miles but for a few bucks at a hardware store for bolds and nuts they were able to be fixed. The waterproofness was fine as the material is completely waterproof. They would slide forward or backward while on the rack. The main problems are in the attachments system. I think they would be fine for road touring but not so for off road touring as the metal hooks and bungie cord don't keep them in place. I used the ortlieb panniers and nothing broke, they didn't slide around, they never came off while riding and nothing ever got wet. I highly recommend them as they will last many tens of thousands of miles of touring. In the long run, you will same money and time with the ortliebs.