I have used the front panniers for a few years on four short tours. The rears are new to me for Christmas They attach easily with the Ortleib system, and they are very secure when mounted.
I like the volume of the front bags at 1900 ci and on my Jandd Extreme front rack, they ride low and feel very stable on the road. The rear bags are 2900 ci and have the same secure mounting system. Both bags have a yellow rain cover zipped into the bottom of the bag. I liked the fact that with the exception of my tent and sleeping bag, these bags provide enough room to hold everything I would need for a backpacking trip. Fabric is coated, nicely stitched and tough.